diff --git a/Descent3/AImain.cpp b/Descent3/AImain.cpp
index 1eecc457..9e9da1b8 100644
--- a/Descent3/AImain.cpp
+++ b/Descent3/AImain.cpp
@@ -204,7 +204,7 @@
  * Fixed AI_SEE_SOUND playing too often (like all the time...)
  *
  * 425   4/27/99 4:41a Jeff
- * only create guidebots if a single player game, or if its a multiplayer
+ * only create guidebots if a single player game, or if it is a multiplayer
  * game and the correct netflag is set
  *
  * 424   4/26/99 11:11a Chris
@@ -5713,7 +5713,7 @@ bool AIObjFriend(object *obj, object *target) {
     return false;
   }
 
-  // If its neutral and not targeting you -- its not an enemy (unless your hostile)
+  // If it is neutral and not targeting you -- it is not an enemy (unless you are hostile)
   if (team == AIF_TEAM_HOSTILE)
     return false;
 
@@ -5782,7 +5782,7 @@ bool AIObjEnemy(object *obj, object *target) {
     return false;
   }
 
-  // If its neutral and not targeting you -- its not an enemy (unless your hostile)
+  // If it is neutral and not targeting you -- it is not an enemy (unless you are hostile)
   if ((team != AIF_TEAM_HOSTILE) && (t_team == AIF_TEAM_NEUTRAL && target->ai_info->target_handle != obj->handle)) {
     return false;
   }
diff --git a/Descent3/DllWrappers.cpp b/Descent3/DllWrappers.cpp
index abdf78be..a8f0ea1a 100644
--- a/Descent3/DllWrappers.cpp
+++ b/Descent3/DllWrappers.cpp
@@ -336,7 +336,7 @@ bool dInven_UsePos(Inventory *inven, object *parent) { return inven->UsePos(pare
 // returns the 'index' position of the current position
 int dInven_GetPos(Inventory *inven) { return inven->GetPos(); }
 
-// checks the pos, if its on a nonselectable item it will move to the next selectable (NULL if none)
+// checks the pos, if it is on a nonselectable item, it will move to the next selectable (NULL if none)
 void dInven_ValidatePos(Inventory *inven, bool forward) { inven->ValidatePos(forward); }
 
 // returns whether an item is selectable
diff --git a/Descent3/DllWrappers.h b/Descent3/DllWrappers.h
index 170eb8a6..521c9da3 100644
--- a/Descent3/DllWrappers.h
+++ b/Descent3/DllWrappers.h
@@ -161,7 +161,7 @@ void dInven_GotoPosTypeID(Inventory *inven, int type, int id);
 bool dInven_UsePos(Inventory *inven, object *parent = NULL);
 // returns the 'index' position of the current position
 int dInven_GetPos(Inventory *inven);
-// checks the pos, if its on a nonselectable item it will move to the next selectable (NULL if none)
+// checks the pos, if it is on a nonselectable item, it will move to the next selectable (NULL if none)
 void dInven_ValidatePos(Inventory *inven, bool forward = true);
 // returns whether an item is selectable
 bool dInven_IsSelectable(Inventory *inven);
diff --git a/Descent3/Game2DLL.cpp b/Descent3/Game2DLL.cpp
index eb04412b..5b5304b9 100644
--- a/Descent3/Game2DLL.cpp
+++ b/Descent3/Game2DLL.cpp
@@ -605,7 +605,7 @@ loaddll:
   }
   return true;
 }
-// Frees the dll if its in memory
+// Frees the dll if it is in memory
 void FreeGameDLL() {
   if (!GameDLLHandle.handle)
     return;
diff --git a/Descent3/Inventory.cpp b/Descent3/Inventory.cpp
index 648f4b7c..81ace0a3 100644
--- a/Descent3/Inventory.cpp
+++ b/Descent3/Inventory.cpp
@@ -564,7 +564,7 @@ bool Inventory::AddCounterMeasure(int id, int aux_type, int aux_id, int flags, c
     }
   }
 
-  // its a new item type/id, so fill in its info
+  // it is a new item type/id, so fill in its info
   if (newnode->count == 1) {
     newnode->type = OBJ_WEAPON;
     newnode->id = id;
@@ -640,7 +640,7 @@ bool Inventory::AddObjectItem(int otype, int oid, int oauxt, int oauxi, int flag
     }
   }
 
-  // its a new item type/id, so fill in its info
+  // it is a new item type/id, so fill in its info
   if (newnode->count == 1) {
     newnode->type = otype;
     newnode->id = oid;
@@ -1393,7 +1393,7 @@ void CounterMeasuresSwitch(bool forward) {
   }
 }
 
-// repositions the pos so its in the correct spot
+// repositions the pos so it is in the correct spot
 void Inventory::ValidatePos(bool forward) {
   if (!pos)
     return;
diff --git a/Descent3/Inventory.h b/Descent3/Inventory.h
index 9f8d22ab..0afe0a1a 100644
--- a/Descent3/Inventory.h
+++ b/Descent3/Inventory.h
@@ -302,7 +302,7 @@ public:
   bool UsePos(object *parent = NULL);
   // returns the 'index' position of the current position
   int GetPos(void);
-  // checks the pos, if its on a nonselectable item it will move to the next selectable (NULL if none)
+  // checks the pos, if it is on a nonselectable item, it will move to the next selectable (NULL if none)
   void ValidatePos(bool forward = true);
   // returns whether an item is selectable
   bool IsSelectable(void);
diff --git a/Descent3/Mission.cpp b/Descent3/Mission.cpp
index 3b24798c..b60cba98 100644
--- a/Descent3/Mission.cpp
+++ b/Descent3/Mission.cpp
@@ -531,7 +531,7 @@
  * first pass at getting multiplayer deaths working
  *
  * 28    1/15/98 11:10a Jeff
- * Added call to set font color before 'loading level' so its white, also
+ * Added call to set font color before 'loading level' so it is white; also
  * turned back on Telcom
  *
  * 27    1/08/98 12:32p Samir
diff --git a/Descent3/OsirisLoadandBind.cpp b/Descent3/OsirisLoadandBind.cpp
index bbcee069..ab24008d 100644
--- a/Descent3/OsirisLoadandBind.cpp
+++ b/Descent3/OsirisLoadandBind.cpp
@@ -1994,7 +1994,7 @@ bool Osiris_CallLevelEvent(int event, tOSIRISEventInfo *data) {
     void *instance = tOSIRISCurrentLevel.instance;
 
     if (instance) {
-      data->me_handle = OBJECT_HANDLE_NONE; // its a level script!...no me
+      data->me_handle = OBJECT_HANDLE_NONE; // it is a level script!...no me
       int16_t ret;
 
       ret = OSIRIS_loaded_modules[dll_id].CallInstanceEvent(0, instance, event, data);
diff --git a/Descent3/SmallViews.cpp b/Descent3/SmallViews.cpp
index d936157c..7ce6bc47 100644
--- a/Descent3/SmallViews.cpp
+++ b/Descent3/SmallViews.cpp
@@ -424,7 +424,7 @@ void DrawSmallViews() {
     object *viewer = ObjGet(svp->objhandle);
     bool kill_viewer = false;
 
-    // Bail if object not around any more, or if its gone too high
+    // Bail if object not around any more, or if it has gone too high
     if (!viewer || (viewer->type == OBJ_DUMMY))
       kill_viewer = true;
 
diff --git a/Descent3/WeaponFire.cpp b/Descent3/WeaponFire.cpp
index 6e3bf86c..6d1bebbf 100644
--- a/Descent3/WeaponFire.cpp
+++ b/Descent3/WeaponFire.cpp
@@ -1305,7 +1305,7 @@ int CreateAndFireWeapon(vector *pos, vector *dir, object *parent, int weapon_num
     obj->mtype.phys_info.velocity *= Players[parent->id].weapon_speed_scalar;
 
   // Set initial velocity to that of the firing object
-  // Don't do it though if its a spawned weapon
+  // Don't do it though if it is a spawned weapon
   if ((obj->mtype.phys_info.flags & PF_USES_PARENT_VELOCITY) && parent->type != OBJ_WEAPON) {
 
     float fdot = (parent->mtype.phys_info.velocity * parent->orient.fvec);
@@ -3088,7 +3088,7 @@ void DoWeaponExploded(object *obj, vector *norm, vector *collision_point, object
                        obj->parent_handle);
 
   if (hit_object == Viewer_object && !(Weapons[obj->id].flags & WF_MATTER_WEAPON))
-    return; // Don't draw if its viewer who is getting hit
+    return; // Don't draw if it is the viewer who is getting hit
 
   if (Weapons[obj->id].flags & WF_PLANAR_BLAST) {
     if (Weapons[obj->id].flags & WF_BLAST_RING) {
diff --git a/Descent3/bsp.cpp b/Descent3/bsp.cpp
index 61949499..62e06752 100644
--- a/Descent3/bsp.cpp
+++ b/Descent3/bsp.cpp
@@ -655,7 +655,7 @@ int BuildBSPNode(bspnode *tree, listnode **polylist, int numpolys) {
       numback++;
     } else if (fate == BSP_COINCIDENT) {
       // Test to see if this plane is exactly the same as the partition plane
-      // If so, remove it from the list.  If its facing the other way, send it down the back list
+      // If so, remove it from the list. If it is facing the other way, send it down the back list.
       float dot = testpoly->plane.a * partition_plane.a + testpoly->plane.b * partition_plane.b +
                   testpoly->plane.c * partition_plane.c;
 
diff --git a/Descent3/damage.cpp b/Descent3/damage.cpp
index 49cc7658..b8ef9837 100644
--- a/Descent3/damage.cpp
+++ b/Descent3/damage.cpp
@@ -867,7 +867,7 @@ bool ApplyDamageToPlayer(object *playerobj, object *killer, int damage_type, flo
         KillPlayer(playerobj, killer, damage_amount, weapon_id);
       }
     } else {
-      // If this is a peer to peer game, and its me taking damage, then ask the server to damage me!
+      // If this is a peer to peer game, and it is me taking damage, then ask the server to damage me!
       if (Netgame.local_role == LR_CLIENT && (Netgame.flags & NF_PEER_PEER) && !server_says) {
         if (playerobj->id == Player_num) {
           MultiSendRequestPeerDamage(killer, weapon_id, damage_type, damage_amount);
diff --git a/Descent3/fireball.cpp b/Descent3/fireball.cpp
index 039676ed..98c37110 100644
--- a/Descent3/fireball.cpp
+++ b/Descent3/fireball.cpp
@@ -752,7 +752,7 @@ void DrawFireballObject(object *obj) {
   norm_time = time_live / obj->lifetime;
   if (norm_time >= 1)
     norm_time = .99999f;            // don't go over!
-  if (obj->id == SMOKE_TRAIL_INDEX) // If its a smoke trail, get image from texture
+  if (obj->id == SMOKE_TRAIL_INDEX) // If it is a smoke trail, get image from texture
   {
     int texnum = obj->ctype.blast_info.bm_handle;
     if (GameTextures[texnum].flags & TF_ANIMATED) {
@@ -1409,7 +1409,7 @@ void DestroyObject(object *objp, float explosion_mag, int death_flags) {
     float fireball_lifeleft = (fireball_visnum != -1) ? VisEffects[fireball_visnum].lifeleft : 2.0;
     CreateSplintersFromBody(objp, explosion_mag, OBJECT_OUTSIDE(objp) ? fireball_lifeleft : (fireball_lifeleft / 2.0));
   }
-  // Make sure its ok to delete if this is a netplayer game
+  // Make sure it is ok to delete if this is a netplayer game
   if ((Game_mode & GM_MULTI) && (Netgame.local_role == LR_CLIENT) && (objp->flags & OF_SERVER_OBJECT))
     ASSERT(objp->flags & OF_SERVER_SAYS_DELETE);
   // Make object go away or become inert
diff --git a/Descent3/gamecinematics.cpp b/Descent3/gamecinematics.cpp
index 8d7b3aa9..134baa00 100644
--- a/Descent3/gamecinematics.cpp
+++ b/Descent3/gamecinematics.cpp
@@ -1041,7 +1041,7 @@ void Cinematic_Frame(void) {
           }
 #endif
 
-          // its a target on a path
+          // it is a target on a path
           matrix orient;
           vector pos;
           int room;
@@ -1726,7 +1726,7 @@ void CannedCinematicIntroCallback(int type) {
       vector fvec = GamePaths[pathnum].pathnodes[1].pos - GamePaths[pathnum].pathnodes[0].pos;
       vm_VectorToMatrix(&orient, &fvec, NULL, NULL);
 
-      // see if it is a hacked 2 node path (i.e. its such a small distance he should move
+      // see if it is a hacked 2 node path (i.e. it is such a small distance it should move)
       if (GamePaths[pathnum].num_nodes == 2) {
         if (fabs(vm_VectorDistance(&GamePaths[pathnum].pathnodes[1].pos, &GamePaths[pathnum].pathnodes[0].pos)) >
             30.0f) {
diff --git a/Descent3/gametexture.cpp b/Descent3/gametexture.cpp
index d2db28f5..ea59c00a 100644
--- a/Descent3/gametexture.cpp
+++ b/Descent3/gametexture.cpp
@@ -63,7 +63,7 @@
  * added new procedural effect
  *
  * 45    2/12/99 3:37p Jason
- * added client-side interpolation...its not fully debugged though.
+ * added client-side interpolation...it is not fully debugged though.
  *
  * 44    2/10/99 3:38p Jason
  * table file filter fixups
diff --git a/Descent3/gametexture.h b/Descent3/gametexture.h
index 8b410181..773e1e26 100644
--- a/Descent3/gametexture.h
+++ b/Descent3/gametexture.h
@@ -345,7 +345,7 @@ int LoadTextureImage(const char *filename, int *type, int texture_size, int mipp
 // Goes through and marks a texture as a tmap2 if its bitmap(s) have transparency
 bool CheckIfTextureIsTmap2(int texnum);
 
-// Touches a texture, makes sure its in memory
+// Touches a texture, makes sure it is in memory
 void TouchTexture(int n);
 
 // Builds the bumpmaps for the texture
diff --git a/Descent3/hud.cpp b/Descent3/hud.cpp
index 214d5667..87e1c19b 100644
--- a/Descent3/hud.cpp
+++ b/Descent3/hud.cpp
@@ -956,7 +956,7 @@ void SGSHudState(CFILE *fp) {
         cf_WriteInt(fp, huditem->data.timer_handle);
         mprintf(0, "sg: restored timer (%x,%x,timer_hndl=%d)\n", huditem->x, huditem->y, huditem->data.timer_handle);
       } else if (huditem->type == HUD_ITEM_CUSTOMTEXT) {
-        // commented out because persistent hud messages are custom text, and its a mess to save the current
+        // commented out because persistent hud messages are custom text, and it is a mess to save the current
         // state of hud persistent messages.
         //	cf_WriteShort(fp, (int16_t)huditem->stat);
         //	cf_WriteByte(fp, (int8_t)huditem->type);
diff --git a/Descent3/loadstate.cpp b/Descent3/loadstate.cpp
index 67160035..b364d3c9 100644
--- a/Descent3/loadstate.cpp
+++ b/Descent3/loadstate.cpp
@@ -1359,7 +1359,7 @@ int LGSObjects(CFILE *fp, int version) {
       goto lgsobjs_fail;
 
     // link into mine.
-    // turn off big object flags if its a big object. (ObjLink will take care of this.)
+    // turn off big object flags if it is a big object. (ObjLink will take care of this.)
     if (op->flags & OF_BIG_OBJECT)
       op->flags &= (~OF_BIG_OBJECT);
 
diff --git a/Descent3/menu.cpp b/Descent3/menu.cpp
index 93107798..d5338717 100644
--- a/Descent3/menu.cpp
+++ b/Descent3/menu.cpp
@@ -425,7 +425,7 @@
  * display mission menu.
  *
  * 71    5/24/98 2:58a Jeff
- * Options menu changes.  MenuOptions now takes a parameter, whether its
+ * Options menu changes.  MenuOptions now takes a parameter, whether it is
  * being called from the game or not
  *
  * 70    5/23/98 6:33p Jeff
diff --git a/Descent3/menu.h b/Descent3/menu.h
index 0c0d543a..29e37875 100644
--- a/Descent3/menu.h
+++ b/Descent3/menu.h
@@ -35,7 +35,7 @@
  * (not hooked up) and level warp cheat.
  *
  * 3     5/24/98 2:58a Jeff
- * Options menu changes.  MenuOptions now takes a parameter, whether its
+ * Options menu changes.  MenuOptions now takes a parameter, whether it is
  * being called from the game or not
  *
  * 2     3/02/98 5:53p Samir
diff --git a/Descent3/multi.cpp b/Descent3/multi.cpp
index d98b4a42..1c41a83a 100644
--- a/Descent3/multi.cpp
+++ b/Descent3/multi.cpp
@@ -555,7 +555,7 @@
  * temp hacks for permissable client server
  *
  * 367   2/12/99 3:37p Jason
- * added client-side interpolation...its not fully debugged though.
+ * added client-side interpolation...it is not fully debugged though.
  *
  * 366   2/10/99 3:48p Jason
  * table filter changes
@@ -1293,7 +1293,7 @@
  *
  * 130   7/08/98 11:27a Jeff
  * removed yesterdays inventory functions, since inventory.cpp has been
- * rolled back...its outdated now
+ * rolled back...it is outdated now
  *
  * 129   7/07/98 7:33p Jeff
  * changes made for inventory use
@@ -2929,7 +2929,7 @@ void MultiMakePlayerReal(int slot) {
   }
 }
 
-// Server is telling us that its done sending players
+// Server is telling us that it is done sending players
 void MultiDoDonePlayers(uint8_t *data) {
   int count = 0;
 
@@ -2946,7 +2946,7 @@ void MultiDoDonePlayers(uint8_t *data) {
   NetPlayers[Player_num].sequence = NETSEQ_REQUEST_BUILDINGS;
 }
 
-// Server is telling us that its done sending buildings
+// Server is telling us that it is done sending buildings
 void MultiDoDoneBuildings(uint8_t *data) {
   MULTI_ASSERT(Netgame.local_role == LR_CLIENT, NULL);
 
@@ -2957,7 +2957,7 @@ void MultiDoDoneBuildings(uint8_t *data) {
   NetPlayers[Player_num].sequence = NETSEQ_REQUEST_OBJECTS;
 }
 
-// Server is telling us that its done sending objects
+// Server is telling us that it is done sending objects
 void MultiDoDoneObjects(uint8_t *data) {
   MULTI_ASSERT(Netgame.local_role == LR_CLIENT, NULL);
 
@@ -2989,7 +2989,7 @@ void MultiDoDoneObjects(uint8_t *data) {
         found = 1;
     }
 
-    // If its not in the server list, delete it!
+    // If it is not in the server list, delete it!
     if (!found) {
       Objects[objnum].flags |= OF_SERVER_SAYS_DELETE;
       ObjDelete(objnum);
@@ -2997,7 +2997,7 @@ void MultiDoDoneObjects(uint8_t *data) {
   }
 }
 
-// Server is telling us that its done sending objects
+// Server is telling us that it is done sending objects
 void MultiDoDoneWorldStates(uint8_t *data) {
   MULTI_ASSERT(Netgame.local_role == LR_CLIENT, NULL);
 
@@ -3052,7 +3052,7 @@ void MultiDoPlayerPos(uint8_t *data) {
 
   uint8_t slot = MultiGetByte(data, &count);
 
-  // Make sure its not out of order
+  // Make sure it is not out of order
   float packet_time = MultiGetFloat(data, &count);
   if (packet_time < NetPlayers[slot].packet_time)
     return;
@@ -3749,7 +3749,7 @@ void MultiDoServerRejectedChecksum(uint8_t *data) {
   D3::ChronoTimer::SleepMS(2000);
 }
 
-// Lets us know if the server says its ok to join
+// Lets us know if the server says it is ok to join
 void MultiDoJoinResponse(uint8_t *data) {
   int count = 0;
 
@@ -3777,7 +3777,7 @@ int MultiFindFreeSlot() {
 }
 
 // Someone is asking to join our game
-// Tell them if its ok
+// Tell them if it is ok
 void MultiDoAskToJoin(uint8_t *data, network_address *from_addr) {
   uint8_t outdata[MAX_GAME_DATA_SIZE];
   int count = 0;
@@ -4160,7 +4160,7 @@ void MultiDoBuilding(uint8_t *data) {
   for (int i = 0; i < num; i++) {
     uint16_t objnum = MultiGetUshort(data, &count);
     if (Objects[objnum].type != OBJ_BUILDING) {
-      mprintf(0, "Error! Server says objnum %d is a building and its not!\n", objnum);
+      mprintf(0, "Error! Server says objnum %d is a building and it is not!\n", objnum);
     } else {
       Multi_building_states[objnum] = 1;
 
@@ -9453,7 +9453,7 @@ void MultiDoBashPlayerShip(uint8_t *data) {
     SetHUDMode(HUD_FULLSCREEN);
 }
 
-// If its been x seconds since we've sent a heartbeat, send another!
+// If it has been x seconds since we've sent a heartbeat, send another!
 
 #define HEARTBEAT_INTERVAL 10.0f
 void MultiSendHeartbeat() {
diff --git a/Descent3/multi.h b/Descent3/multi.h
index 985918f2..db4433ac 100644
--- a/Descent3/multi.h
+++ b/Descent3/multi.h
@@ -146,7 +146,7 @@
  * warnings)
  *
  * 135   2/12/99 3:38p Jason
- * added client-side interpolation...its not fully debugged though.
+ * added client-side interpolation...it is not fully debugged though.
  *
  * 134   2/09/99 6:52p Jeff
  * implemented 'typing inidcator' in multiplayer...players that are typing
@@ -527,7 +527,7 @@ extern bool Multi_bail_ui_menu;
 #define MP_ENTERING_GAME 9        // I'm entering the game
 #define MP_DISCONNECT 10          // A player has disconnected
 #define MP_PLAYER_FIRE 11         // A player is firing
-#define MP_ASK_TO_JOIN 12         // Asking if its ok to join
+#define MP_ASK_TO_JOIN 12         // Asking if it is ok to join
 #define MP_JOIN_RESPONSE 13       // Answering MP_ASK_TO_JOIN
 #define MP_SERVER_QUIT 14         // Server is quitting
 #define MP_LEAVE_GAME 15          // A client is leaving the game
diff --git a/Descent3/multi_connect.cpp b/Descent3/multi_connect.cpp
index 068d145c..af0fdc4c 100644
--- a/Descent3/multi_connect.cpp
+++ b/Descent3/multi_connect.cpp
@@ -378,7 +378,7 @@ int TryToJoinServer(network_address *addr) {
       }
       return 0;
     } else
-      mprintf(0, "Server says its ok to join!\n");
+      mprintf(0, "Server says it is ok to join!\n");
 
     nw_ConnectToServer(&sock, addr);
     if (sock != INVALID_SOCKET && sock != 0) {
diff --git a/Descent3/multi_dll_mgr.cpp b/Descent3/multi_dll_mgr.cpp
index f4c2cbbc..9d0871d5 100644
--- a/Descent3/multi_dll_mgr.cpp
+++ b/Descent3/multi_dll_mgr.cpp
@@ -569,7 +569,7 @@ void GetMultiAPI(multi_api *api) {
   // anyway.
   // atexit(FreeMultiDLL);
 }
-// Frees the dll if its in memory
+// Frees the dll if it is in memory
 void FreeMultiDLL() {
   if (!MultiDLLHandle.handle)
     return;
diff --git a/Descent3/multi_server.cpp b/Descent3/multi_server.cpp
index a03f3e94..c1aad0fc 100644
--- a/Descent3/multi_server.cpp
+++ b/Descent3/multi_server.cpp
@@ -1882,7 +1882,7 @@ void MultiFlushAllIncomingBuffers() {
   }
 }
 
-// Checks to see if its any powerups need repositioning on the client machine
+// Checks to see if it is any powerup needing repositioning on the client machine
 void MultiCheckToRepositionPowerups() {
   int i;
   static int invis_id = -2;
@@ -1934,7 +1934,7 @@ void MultiCheckToRepositionPowerups() {
   }
 }
 
-// Checks to see if its time to respawn any powerups
+// Checks to see if it is time to respawn any powerups
 void MultiCheckToRespawnPowerups() {
   int i, t;
 
diff --git a/Descent3/pilot.cpp b/Descent3/pilot.cpp
index 220ab2ec..dba17799 100644
--- a/Descent3/pilot.cpp
+++ b/Descent3/pilot.cpp
@@ -1761,7 +1761,7 @@ void PltMakeFNValid(char *name) {
 
 ////////////////////////////////////////////////////////
 // Copies the key/joy config of a pilot to another (src must exist!) (Keep up to date with Read/Write file)
-// this will also save out the dest, so make sure its filled in before calling function
+// this will also save out the dest, so make sure it is filled in before calling function
 bool PltCopyKeyConfig(pilot *src, pilot *dest) {
   // check to make sure src exists
   ASSERT(src);
diff --git a/Descent3/procedurals.cpp b/Descent3/procedurals.cpp
index 55152b2e..93bce5db 100644
--- a/Descent3/procedurals.cpp
+++ b/Descent3/procedurals.cpp
@@ -1350,7 +1350,7 @@ void EvaluateProcedural(int handle) {
 
   int dest_bitmap = procedural->procedural_bitmap;
   if (bm_w(dest_bitmap, 0) != PROC_SIZE) {
-    mprintf(0, "Couldn't evaluate procedural because its not %d x %d!\n", PROC_SIZE, PROC_SIZE);
+    mprintf(0, "Couldn't evaluate procedural because it is not %d x %d!\n", PROC_SIZE, PROC_SIZE);
     return;
   }
   if (GameTextures[handle].flags & TF_WATER_PROCEDURAL)
diff --git a/Descent3/program.h b/Descent3/program.h
index a05deac0..f6632166 100644
--- a/Descent3/program.h
+++ b/Descent3/program.h
@@ -163,7 +163,7 @@
 #define RELEASE_VERSION 0x2     // final release candidate: no debug, beta, editor
 
 #define BETA_VERSION 0x1000 // beta modifier.
-#define DEMO_VERSION 0x2000 // same as release, but its the demo.
+#define DEMO_VERSION 0x2000 // same as release, but it is the demo.
 
 struct program_version {
   int version_type;
diff --git a/Descent3/render.cpp b/Descent3/render.cpp
index be7f3be6..417826ba 100644
--- a/Descent3/render.cpp
+++ b/Descent3/render.cpp
@@ -1924,7 +1924,7 @@ void RenderFace(room *rp, int facenum) {
     rend_SetTextureType(tt);
   } else
     rend_SetTextureType(TT_PERSPECTIVE);
-  if (face_cc.cc_or) // Possible triangulate this face cuz its off screen somewhat
+  if (face_cc.cc_or) // Possible triangulate this face because it is off screen somewhat
   {
     if (Room_light_val < 1.0)
       do_triangle_test = 1;
@@ -3302,7 +3302,7 @@ void RenderMirrorRooms() {
     Render_mirror_for_room = false;
     bool do_mirror_face = false;
     rp->flags &= ~RF_MIRROR_VISIBLE;
-    // Make sure its really ok to render this mirrored room
+    // Make sure it is really ok to render this mirrored room
     if (rp->mirror_face != -1)
       do_mirror_face = true;
     if (rp->mirror_face >= rp->num_faces)
diff --git a/Descent3/renderobject.cpp b/Descent3/renderobject.cpp
index 45cf5a21..1a000a42 100644
--- a/Descent3/renderobject.cpp
+++ b/Descent3/renderobject.cpp
@@ -2085,7 +2085,7 @@ void DrawPlayerTypingIndicator(object *obj) {
   float IndicatorTan;
   float rad = (float)(3.14 * (float)(10) / 180.0);
   IndicatorTan = tan(rad);
-  // See if its in our viewcone
+  // See if it is in our viewcone
   vector subvec = obj->pos - Player_object->pos;
   vm_NormalizeVectorFast(&subvec);
   if ((vm_DotProduct(&subvec, &Player_object->orient.fvec)) < IndicatorTan)
@@ -2188,7 +2188,7 @@ void DrawPlayerNameOnHud(object *obj) {
   if (color < 0)
     return;
 
-  // See if its in our viewcone
+  // See if it is in our viewcone
   vector subvec = obj->pos - Player_object->pos;
   vm_NormalizeVectorFast(&subvec);
   if ((vm_DotProduct(&subvec, &Player_object->orient.fvec)) < HudNameTan)
diff --git a/Descent3/robotfire.cpp b/Descent3/robotfire.cpp
index 6e7328c3..45f0aa0c 100644
--- a/Descent3/robotfire.cpp
+++ b/Descent3/robotfire.cpp
@@ -253,7 +253,7 @@ void WBFireBattery(object *obj, otype_wb_info *static_wb, int poly_wb_index, int
     }
   }
 
-  // Don't do any of this if its the local client and a permissable netgame
+  // Don't do any of this if it is the local client and a permissable netgame
   if (!((Game_mode & GM_MULTI) && obj->type == OBJ_PLAYER && obj->id == Player_num && Netgame.flags & NF_PERMISSABLE)) {
     p_dwb->last_fire_time = Gametime;
 
diff --git a/Descent3/viseffect.cpp b/Descent3/viseffect.cpp
index 57775348..150611cc 100644
--- a/Descent3/viseffect.cpp
+++ b/Descent3/viseffect.cpp
@@ -1493,7 +1493,7 @@ void DrawVisAxisBillboard(vis_effect *vis) {
   if (norm_time >= 1)
     norm_time = 0.99999f; // don't go over!
 
-  if (vis->billboard_info.texture) // If its a texture, get image from texture
+  if (vis->billboard_info.texture) // If it is a texture, get image from texture
   {
     int texnum = vis->custom_handle;
     if (GameTextures[texnum].flags & TF_ANIMATED) {
@@ -1891,7 +1891,7 @@ void DrawVisEffect(vis_effect *vis) {
     size = (vis->size / 2) + ((vis->size * norm_time) / 2);
   }
 
-  if (vis->id == SMOKE_TRAIL_INDEX) // If its a smoke trail, get image from texture
+  if (vis->id == SMOKE_TRAIL_INDEX) // If it is a smoke trail, get image from texture
   {
     int texnum = vis->custom_handle;
     if (GameTextures[texnum].flags & TF_ANIMATED) {
diff --git a/Descent3/weapon.cpp b/Descent3/weapon.cpp
index cb845942..f4b533dc 100644
--- a/Descent3/weapon.cpp
+++ b/Descent3/weapon.cpp
@@ -732,9 +732,9 @@ void RemapWeapons() {
 
         new_index = MoveWeaponFromIndex(i);
         RemapAllWeaponObjects(i, new_index);
-      } else // this weapon is a static weapon, make sure its in its place
+      } else // this weapon is a static weapon, make sure it is in its place
       {
-        if (i != match) // its not where it belongs, move it
+        if (i != match) // it is not where it belongs, move it
         {
           int new_index;
 
diff --git a/Descent3/weather.h b/Descent3/weather.h
index 45f94b10..2ffde5cb 100644
--- a/Descent3/weather.h
+++ b/Descent3/weather.h
@@ -30,7 +30,7 @@ struct weather {
   int flags; // see weather flags, above
 
   float snow_intensity_scalar; // how hard it is snowing
-  float rain_intensity_scalar; // how hard its raining
+  float rain_intensity_scalar; // how hard it is raining
   int rain_color;              // the color of the rain
   int lightning_color;         // the color of the lightning
   int sky_flash_color;         // the color of the sky when lightning occurs
diff --git a/bitmap/bitmain.cpp b/bitmap/bitmain.cpp
index a46c70c6..6e0aab40 100644
--- a/bitmap/bitmain.cpp
+++ b/bitmap/bitmain.cpp
@@ -680,7 +680,7 @@ Start:
 int bm_GetFileType(CFILE *infile, const char *dest) {
   char iffcheck[4];
   int i;
-  // First, check if its a pcx
+  // First, check if it is a PCX
   i = strlen(dest);
   if (dest[i - 4] == '.' && (dest[i - 3] == 'p' || dest[i - 3] == 'P') && (dest[i - 2] == 'c' || dest[i - 2] == 'C') &&
       (dest[i - 1] == 'x' || dest[i - 1] == 'X'))
diff --git a/editor/AmbientSoundPattern.cpp b/editor/AmbientSoundPattern.cpp
index 57edb04d..dfc14c1e 100644
--- a/editor/AmbientSoundPattern.cpp
+++ b/editor/AmbientSoundPattern.cpp
@@ -459,7 +459,7 @@ void CAmbientSoundPattern::OnASPCheckIn() {
 
         OutrageMessageBox("File checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Gamefiles[n].name, PAGETYPE_GAMEFILE, 1);
         ASSERT(dret == 1);
         mng_EraseLocker();
diff --git a/editor/Erooms.cpp b/editor/Erooms.cpp
index 909252e2..76bf1b02 100644
--- a/editor/Erooms.cpp
+++ b/editor/Erooms.cpp
@@ -793,7 +793,7 @@ void SaveRoom(int n, char *filename) {
   int16_t Room_to_texture[MAX_TEXTURES];
   int t, found_it = 0;
 
-  // Make sure its in use!
+  // Make sure it is in use!
   ASSERT(Rooms[n].used);
 
   outfile = (CFILE *)cfopen(filename, "wb");
diff --git a/editor/FilePageDialog.cpp b/editor/FilePageDialog.cpp
index 38a1675d..32c8ffc0 100644
--- a/editor/FilePageDialog.cpp
+++ b/editor/FilePageDialog.cpp
@@ -270,7 +270,7 @@ void CFilePageDialog::OnCheckinFile() {
 
           //@@OutrageMessageBox ("File checked in.");
 
-          // Delete it from local pagefile if its there
+          // Delete it from local pagefile if it is there
           int dret = mng_DeletePage(Gamefiles[n].name, PAGETYPE_GAMEFILE, 1);
           ASSERT(dret == 1);
 
@@ -322,7 +322,7 @@ void CFilePageDialog::OnDeleteFile() {
       continue;
     }
 
-    // Make sure its to be deleted
+    // Make sure it is to be deleted
     answer = MessageBox("Are you sure you want to delete this gamefile?", Gamefiles[n].name, MB_YESNO);
     if (answer == IDNO)
       continue;
@@ -337,7 +337,7 @@ void CFilePageDialog::OnDeleteFile() {
         mprintf(0, ErrorString);
         Int3();
       }
-    } else // if its network, delete it from both the net and local drives
+    } else // if it is network, delete it from both the net and local drives
     {
 
       mng_FreeTrackLock(tl);
diff --git a/editor/LightingDialog.cpp b/editor/LightingDialog.cpp
index 555adc7f..ce50bc62 100644
--- a/editor/LightingDialog.cpp
+++ b/editor/LightingDialog.cpp
@@ -1572,7 +1572,7 @@ void ResaveBitmap(const char *name) {
   if (bm_handle >= 0) {
     char search[256];
 
-    // Make sure its paged in
+    // Make sure it is paged in
     bm_data(bm_handle, 0);
 
     ddio_MakePath(search, LocalD3Dir, "data", "graphics", GameBitmaps[bm_handle].name, NULL);
@@ -1586,7 +1586,7 @@ void ResaveBitmap(const char *name) {
 
     bm_handle = bm_AllocLoadFileBitmap(search, 0);
     if (bm_handle >= 0) {
-      // Make sure its paged in
+      // Make sure it is paged in
       bm_data(bm_handle, 0);
 
       mprintf(0, "Resaving bitmap %s.\n", search);
diff --git a/editor/MegacellDialog.cpp b/editor/MegacellDialog.cpp
index d37750c4..46f7b09d 100644
--- a/editor/MegacellDialog.cpp
+++ b/editor/MegacellDialog.cpp
@@ -263,7 +263,7 @@ void CMegacellDialog::OnCheckinMegacell() {
       else {
         OutrageMessageBox("Megacell checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Megacells[n].name, PAGETYPE_MEGACELL, 1);
         ASSERT(dret == 1);
         mng_EraseLocker();
@@ -298,7 +298,7 @@ void CMegacellDialog::OnDeleteMegacell() {
     return;
   }
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   answer = MessageBox("Are you sure you want to delete this megacell?", Megacells[n].name, MB_YESNO);
   if (answer == IDNO)
     return;
@@ -319,7 +319,7 @@ void CMegacellDialog::OnDeleteMegacell() {
       mprintf(0, ErrorString);
       Int3();
     }
-  } else // if its network, delete it from both the net and local drives
+  } else // if it is network, delete it from both the net and local drives
   {
 
     mng_FreeTrackLock(tl);
diff --git a/editor/ScriptLevelInterface.cpp b/editor/ScriptLevelInterface.cpp
index 0ffe9f45..2e3d52ea 100644
--- a/editor/ScriptLevelInterface.cpp
+++ b/editor/ScriptLevelInterface.cpp
@@ -997,7 +997,7 @@ bool DeleteGamefile(char *tempbuffer) {
     } else {
       removed = true;
     }
-  } else { // if its network, delete it from both the net and local drives
+  } else { // if it is network, delete it from both the net and local drives
     mng_FreeTrackLock(tl);
     mng_DeletePage(tempbuffer, PAGETYPE_GAMEFILE, 1);
     mng_DeletePage(tempbuffer, PAGETYPE_GAMEFILE, 0);
@@ -1094,7 +1094,7 @@ bool CheckInGamefile(char *tempbuffer, bool show_ok_confirmation) {
 
         cf_CopyFile(destname, srcname);
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Gamefiles[n].name, PAGETYPE_GAMEFILE, 1);
         ASSERT(dret == 1);
 
@@ -1106,7 +1106,7 @@ bool CheckInGamefile(char *tempbuffer, bool show_ok_confirmation) {
         if (show_ok_confirmation)
           OutrageMessageBox("%s checked in.", tempbuffer);
 
-        // Make sure its checked in
+        // Make sure it is checked in
         if (cf_Diff(destname, srcname)) {
           ASSERT(1);                      // Get Jason! File didn't check in correctly!
           cf_CopyFile(destname, srcname); // Do this so we can trace whats happening
@@ -1205,7 +1205,7 @@ bool UndoCheckOutGamefile(char *tempbuffer) {
   if ((tl = mng_FindTrackLock(Gamefiles[n].name, PAGETYPE_GAMEFILE)) == -1)
     return false;
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   if (OutrageMessageBox(MBOX_YESNO,
                         "Are you sure you want to undo your lock on %s and lose any changes you may have made?",
                         tempbuffer) != IDYES)
diff --git a/editor/ScriptWizard.cpp b/editor/ScriptWizard.cpp
index 6cd612f8..8dcb81ee 100644
--- a/editor/ScriptWizard.cpp
+++ b/editor/ScriptWizard.cpp
@@ -469,7 +469,7 @@ void CScriptWizard::OnUnlock() {
 
         OutrageMessageBox("Script checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Gamefiles[n].name, PAGETYPE_GAMEFILE, 1);
         ASSERT(dret == 1);
         mng_EraseLocker();
diff --git a/editor/WorldObjectsDoorDialog.cpp b/editor/WorldObjectsDoorDialog.cpp
index 43ea80f0..bd2330df 100644
--- a/editor/WorldObjectsDoorDialog.cpp
+++ b/editor/WorldObjectsDoorDialog.cpp
@@ -548,7 +548,7 @@ void CWorldObjectsDoorDialog::OnCheckinDoor() {
 
         OutrageMessageBox("Door checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Doors[n].name, PAGETYPE_DOOR, 1);
 
         ASSERT(dret == 1);
@@ -591,7 +591,7 @@ void CWorldObjectsDoorDialog::OnDeleteDoor() {
     return;
   }
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   answer = MessageBox("Are you sure you want to delete this door?", Doors[n].name, MB_YESNO);
   if (answer == IDNO)
     return;
@@ -609,7 +609,7 @@ void CWorldObjectsDoorDialog::OnDeleteDoor() {
       mprintf(0, ErrorString);
       Int3();
     }
-  } else // if its network, delete it from both the net and local drives
+  } else // if it is network, delete it from both the net and local drives
   {
 
     mng_FreeTrackLock(tl);
diff --git a/editor/WorldObjectsGenericDialog.cpp b/editor/WorldObjectsGenericDialog.cpp
index bc1887a9..7bb1e376 100644
--- a/editor/WorldObjectsGenericDialog.cpp
+++ b/editor/WorldObjectsGenericDialog.cpp
@@ -817,7 +817,7 @@ void CWorldObjectsGenericDialog::OnGenericCheckIn() {
 
         OutrageMessageBox("Object checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Object_info[m_current].name, PAGETYPE_GENERIC, 1);
 
         ASSERT(dret == 1);
@@ -859,7 +859,7 @@ void CWorldObjectsGenericDialog::OnGenericDelete() {
     return;
   }
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   answer = MessageBox("Are you sure you want to delete this object?", Object_info[m_current].name, MB_YESNO);
   if (answer == IDNO)
     return;
@@ -877,7 +877,7 @@ void CWorldObjectsGenericDialog::OnGenericDelete() {
       mprintf(0, ErrorString);
       Int3();
     }
-  } else // if its network, delete it from both the net and local drives
+  } else // if it is network, delete it from both the net and local drives
   {
 
     mng_FreeTrackLock(tl);
@@ -1381,7 +1381,7 @@ void CWorldObjectsGenericDialog::OnGenericUndoLock() {
   if ((tl = mng_FindTrackLock(Object_info[m_current].name, PAGETYPE_GENERIC)) == -1)
     return;
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   if (OutrageMessageBox(MBOX_YESNO,
                         "Are you sure you want to undo your lock and lose any changes you may have made?") != IDYES)
     return;
diff --git a/editor/WorldObjectsPlayerDialog.cpp b/editor/WorldObjectsPlayerDialog.cpp
index 0b377ac4..95193b69 100644
--- a/editor/WorldObjectsPlayerDialog.cpp
+++ b/editor/WorldObjectsPlayerDialog.cpp
@@ -326,7 +326,7 @@ void CWorldObjectsPlayerDialog::OnPshipCheckin() {
 
         OutrageMessageBox("Ship checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Ships[n].name, PAGETYPE_SHIP, 1);
         ASSERT(dret == 1);
         mng_EraseLocker();
@@ -357,7 +357,7 @@ void CWorldObjectsPlayerDialog::OnPshipDelete() {
     return;
   }
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   answer = MessageBox("Are you sure you want to delete this ship?", Ships[n].name, MB_YESNO);
   if (answer == IDNO)
     return;
@@ -375,7 +375,7 @@ void CWorldObjectsPlayerDialog::OnPshipDelete() {
       mprintf(0, ErrorString);
       Int3();
     }
-  } else // if its network, delete it from both the net and local drives
+  } else // if it is network, delete it from both the net and local drives
   {
 
     mng_FreeTrackLock(tl);
diff --git a/editor/WorldObjectsPowerupDialog.cpp b/editor/WorldObjectsPowerupDialog.cpp
index 90b341bb..7bb2c88a 100644
--- a/editor/WorldObjectsPowerupDialog.cpp
+++ b/editor/WorldObjectsPowerupDialog.cpp
@@ -159,7 +159,7 @@ void CWorldObjectsPowerupDialog::OnAddNewPowerup() {
 	
 	strcpy (Powerups[powerup_handle].name,cur_name);
 
-	// If its a 3d model instead of an animation, flag it
+	// If it is a 3d model instead of an animation, flag it
 
 	if (!model)
 		Powerups[powerup_handle].flags|=PF_IMAGE_BITMAP;
@@ -260,7 +260,7 @@ void CWorldObjectsPowerupDialog::OnCheckin() {
 
 				OutrageMessageBox ("Powerup checked in.");
 
-				// Delete it from local pagefile if its there
+				// Delete it from local pagefile if it is there
 				int dret=mng_DeletePowPage (Powerups[n].name,1);
 				ASSERT (dret==1);
 				mng_EraseLocker();
@@ -278,7 +278,7 @@ void CWorldObjectsPowerupDialog::OnCheckin() {
 
 // Deletes the current powerup
 // If the user has it checked out, will delete it from the net pagefile
-// If its local only, it will get deleted from the local pagefile
+// If it is local only, it will get deleted from the local pagefile
 void CWorldObjectsPowerupDialog::OnDeletePowerup() {
 #if 0
 	int answer,tl;
@@ -295,7 +295,7 @@ void CWorldObjectsPowerupDialog::OnDeletePowerup() {
 		return;
 	}
 
-	//Make sure its to be deleted
+	//  Make sure it is to be deleted
 	answer=MessageBox ("Are you sure you want to delete this powerup?",Powerups[n].name,MB_YESNO);
 	if (answer==IDNO)
 		return;
@@ -316,7 +316,7 @@ void CWorldObjectsPowerupDialog::OnDeletePowerup() {
 			Int3();
 		}
 	}
-	else // if its network, delete it from both the net and local drives
+	else // if it is network, delete it from both the net and local drives
 	{
 		mng_FreeTrackLock (tl);
 		mng_DeletePowPage (Powerups[n].name,1);
@@ -836,7 +836,7 @@ void CWorldObjectsPowerupDialog::OnLoadImage() {
 		return;
 	}
 
-	// If its a 3d model instead of an animation, flag it
+	// If it is a 3d model instead of an animation, flag it
 	
 	powerup_handle=D3EditState.current_powerup;
 
diff --git a/editor/WorldObjectsRobotDialog.cpp b/editor/WorldObjectsRobotDialog.cpp
index 7c9581eb..75783897 100644
--- a/editor/WorldObjectsRobotDialog.cpp
+++ b/editor/WorldObjectsRobotDialog.cpp
@@ -239,7 +239,7 @@ void CWorldObjectsRobotDialog::OnCheckinRobot() {
 				
 				OutrageMessageBox ("Robot checked in.");
 
-				// Delete it from local pagefile if its there
+				// Delete it from local pagefile if it is there
 				int dret=mng_DeleteRobotPage (Robots[n].name,1);
 				ASSERT (dret==1);
 				mng_EraseLocker();
@@ -271,7 +271,7 @@ void CWorldObjectsRobotDialog::OnDeleteRobot() {
 		return;
 	}
 
-	//Make sure its to be deleted
+	// Make sure it is to be deleted
 	answer=MessageBox ("Are you sure you want to delete this robot?",Robots[n].name,MB_YESNO);
 	if (answer==IDNO)
 		return;
@@ -296,7 +296,7 @@ void CWorldObjectsRobotDialog::OnDeleteRobot() {
 			Int3();
 		}
 	}
-	else // if its network, delete it from both the net and local drives
+	else // if it is network, delete it from both the net and local drives
 	{
 		
 		mng_FreeTrackLock (tl);
diff --git a/editor/WorldSoundsDialog.cpp b/editor/WorldSoundsDialog.cpp
index 9300a9cb..b18b3ee9 100644
--- a/editor/WorldSoundsDialog.cpp
+++ b/editor/WorldSoundsDialog.cpp
@@ -307,7 +307,7 @@ void CWorldSoundsDialog::OnCheckinSound() {
 
         OutrageMessageBox("Sound checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Sounds[n].name, PAGETYPE_SOUND, 1);
         ASSERT(dret == 1);
         mng_EraseLocker();
@@ -340,7 +340,7 @@ void CWorldSoundsDialog::OnDeleteSound() {
     return;
   }
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   answer = MessageBox("Are you sure you want to delete this sound?", Sounds[n].name, MB_YESNO);
   if (answer == IDNO)
     return;
@@ -358,7 +358,7 @@ void CWorldSoundsDialog::OnDeleteSound() {
       mprintf(0, ErrorString);
       Int3();
     }
-  } else // if its network, delete it from both the net and local drives
+  } else // if it is network, delete it from both the net and local drives
   {
 
     mng_FreeTrackLock(tl);
diff --git a/editor/WorldWeaponsDialog.cpp b/editor/WorldWeaponsDialog.cpp
index 64957d05..c0858565 100644
--- a/editor/WorldWeaponsDialog.cpp
+++ b/editor/WorldWeaponsDialog.cpp
@@ -572,7 +572,7 @@ void CWorldWeaponsDialog::OnDeleteWeapon() {
     return;
   }
 
-  // Make sure its to be deleted
+  // Make sure it is to be deleted
   answer = MessageBox("Are you sure you want to delete this weapon?", Weapons[n].name, MB_YESNO);
   if (answer == IDNO)
     return;
@@ -590,7 +590,7 @@ void CWorldWeaponsDialog::OnDeleteWeapon() {
       mprintf(0, ErrorString);
       Int3();
     }
-  } else // if its network, delete it from both the net and local drives
+  } else // if it is network, delete it from both the net and local drives
   {
 
     mng_FreeTrackLock(tl);
@@ -688,7 +688,7 @@ void CWorldWeaponsDialog::OnCheckinWeapon() {
 
         OutrageMessageBox("Weapon checked in.");
 
-        // Delete it from local pagefile if its there
+        // Delete it from local pagefile if it is there
         int dret = mng_DeletePage(Weapons[n].name, PAGETYPE_WEAPON, 1);
         ASSERT(dret == 1);
         mng_EraseLocker();
diff --git a/legacy/powerball/powerball.cpp b/legacy/powerball/powerball.cpp
index d06e0758..0e529bda 100644
--- a/legacy/powerball/powerball.cpp
+++ b/legacy/powerball/powerball.cpp
@@ -931,7 +931,7 @@ void GetGameStartPacket(uint8_t *data) {
     UpdatePowerBallEffectOnPlayer(WhoHasPowerBall, true);
   }
 
-  // we need to find the objnum of the PowerBall...its there somewhere
+  // we need to find the objnum of the PowerBall...it is there somewhere
   DLLmprintf(0, "Looking for powerball in level\n");
   for (int i = 0; i < MAX_OBJECTS; i++) {
     if ((PBall.Objects[i].type == OBJ_POWERUP) && (PBall.Objects[i].id == PowerBallID)) {
diff --git a/lib/bitmap.h b/lib/bitmap.h
index 09c3632e..b5ae09f7 100644
--- a/lib/bitmap.h
+++ b/lib/bitmap.h
@@ -27,7 +27,7 @@
 #define MAX_BITMAPS 5000
 #define NUM_MIP_LEVELS 5
 
-// It really doesn't matter what these are, as long as its above 10
+// It really doesn't matter what these are, as long as it is above 10
 #define OUTRAGE_4444_COMPRESSED_MIPPED 121
 #define OUTRAGE_1555_COMPRESSED_MIPPED 122
 #define OUTRAGE_NEW_COMPRESSED_MIPPED 123
diff --git a/lib/game2dll.h b/lib/game2dll.h
index 247e2fd1..36e2e813 100644
--- a/lib/game2dll.h
+++ b/lib/game2dll.h
@@ -82,7 +82,7 @@ extern dllinfo DLLInfo;
 // The chokepoint function to call the dll function
 void CallGameDLL(int eventnum, dllinfo *data);
 
-// Frees the dll if its in memory
+// Frees the dll if it is in memory
 void FreeGameDLL();
 
 // Loads the game dll.  Returns 1 on success, else 0 on failure
diff --git a/manage/doorpage.cpp b/manage/doorpage.cpp
index a52a6bd7..3f58e89f 100644
--- a/manage/doorpage.cpp
+++ b/manage/doorpage.cpp
@@ -461,7 +461,7 @@ int mng_AssignDoorPageToDoor(mngs_door_page *doorpage, int n) {
 
   // First see if our image differs from the one on the net
   // If it is, make a copy
-  // If its a release version, don't do any of this
+  // If it is a release version, don't do any of this
 
 #ifndef RELEASE
   if (Network_up) {
diff --git a/manage/gamefilepage.cpp b/manage/gamefilepage.cpp
index 3f5a6bf6..3406c95d 100644
--- a/manage/gamefilepage.cpp
+++ b/manage/gamefilepage.cpp
@@ -223,7 +223,7 @@ int mng_AssignGamefilePageToGamefile(mngs_gamefile_page *gamefilepage, int n) {
 
   // First see if our image differs from the one on the net
   // If it is, make a copy
-  // If its a release version, don't do any of this
+  // If it is a release version, don't do any of this
 
 #ifndef RELEASE
   if (Network_up) {
diff --git a/manage/generic.cpp b/manage/generic.cpp
index f7257441..4570bd42 100644
--- a/manage/generic.cpp
+++ b/manage/generic.cpp
@@ -1935,7 +1935,7 @@ int mng_AssignGenericPageToObjInfo(mngs_generic_page *genericpage, int n, CFILE
   strcpy(objinfopointer->icon_name, genericpage->objinfo_struct.icon_name);
   // First see if our image differs from the one on the net
   // If it is, make a copy
-  // If its a release version, don't do any of this
+  // If it is a release version, don't do any of this
 
 #ifndef RELEASE
   if (Network_up) {
@@ -2324,7 +2324,7 @@ int mng_GetGuaranteedGenericPage(char *name, CFILE *infile) {
   int i;
   mngs_generic_page page;
 
-  // See if its in memory
+  // See if it is in memory
   i = FindObjectIDName(name);
   if (i != -1)
     return i;
diff --git a/manage/manage.cpp b/manage/manage.cpp
index ab06bf7c..d9b8de78 100644
--- a/manage/manage.cpp
+++ b/manage/manage.cpp
@@ -1245,7 +1245,7 @@ int mng_LoadNetPages(int show_progress) {
   }
   start_time = timer_GetTime();
   while (!cfeof(infile)) {
-    // Read in a pagetype.  If its a page we recognize, load it
+    // Read in a pagetype. If it is a page we recognize, load it.
     //		mprintf(0,".");
     if (show_progress) {
 
@@ -1408,7 +1408,7 @@ int mng_LoadLocalPages() {
   }
   Loading_locals = 1;
   while (!cfeof(infile)) {
-    // Read in a pagetype.  If its a page we recognize, load it
+    // Read in a pagetype. If it is a page we recognize, load it.
 
     pagetype = cf_ReadByte(infile);
     if (!Old_table_method)
@@ -2841,7 +2841,7 @@ void mng_CompileAddonPages(void) {
     // as we come across each page, check to see if it was
     // ever overlayed.
     while (!cfeof(file)) {
-      // Read in a pagetype.  If its a page we recognize, load it
+      // Read in a pagetype. If it is a page we recognize, load it.
       page_pos = cftell(file);
       pagetype = cf_ReadByte(file);
       len = cf_ReadInt(file);
@@ -2958,7 +2958,7 @@ void mng_LoadAddonPages() {
     }
     Loading_addon_table = c;
     while (!cfeof(infile)) {
-      // Read in a pagetype.  If its a page we recognize, load it
+      // Read in a pagetype. If it is a page we recognize, load it.
       pagetype = cf_ReadByte(infile);
       len = cf_ReadInt(infile);
 
diff --git a/manage/shippage.cpp b/manage/shippage.cpp
index d3db1f4f..af5329e5 100644
--- a/manage/shippage.cpp
+++ b/manage/shippage.cpp
@@ -942,7 +942,7 @@ int mng_AssignShipPageToShip(mngs_ship_page *shippage, int n, CFILE *infile) {
 
   // First see if our image differs from the one on the net
   // If it is, make a copy
-  // If its a release version, don't do any of this
+  // If it is a release version, don't do any of this
 
 #ifndef RELEASE
   if (Network_up) {
diff --git a/manage/soundpage.cpp b/manage/soundpage.cpp
index 8dfa0600..cef8d3c8 100644
--- a/manage/soundpage.cpp
+++ b/manage/soundpage.cpp
@@ -405,7 +405,7 @@ int mng_AssignSoundPageToSound(mngs_sound_page *soundpage, int n) {
   strcpy(soundpointer->name, soundpage->sound_struct.name);
 // First see if our raw differs from the one on the net
 // If it is, make a copy
-// If its a release version, don't do any of this
+// If it is a release version, don't do any of this
 #ifndef RELEASE
   if (Network_up) {
     UpdatePrimitive(LocalSoundsDir / soundpage->raw_name, NetSoundsDir / soundpage->raw_name, soundpage->raw_name,
@@ -560,7 +560,7 @@ void mng_LoadLocalSoundPage(CFILE *infile) {
 int mng_GetGuaranteedSoundPage(char *name, CFILE *infile) {
   int i;
   mngs_sound_page soundpage;
-  // See if its in memory
+  // See if it is in memory
   i = FindSoundName(name);
   if (i != -1)
     return i;
diff --git a/manage/texpage.cpp b/manage/texpage.cpp
index 316acc8c..98a21678 100644
--- a/manage/texpage.cpp
+++ b/manage/texpage.cpp
@@ -1244,7 +1244,7 @@ void mng_LoadLocalTexturePage(CFILE *infile) {
 int mng_GetGuaranteedTexturePage(char *name, CFILE *infile) {
   int i;
 
-  // See if its in memory
+  // See if it is in memory
   i = FindTextureName(name);
   if (i != -1)
     return i;
diff --git a/manage/weaponpage.cpp b/manage/weaponpage.cpp
index 60613c72..7ee237ed 100644
--- a/manage/weaponpage.cpp
+++ b/manage/weaponpage.cpp
@@ -1317,7 +1317,7 @@ int mng_GetGuaranteedWeaponPage(char *name, CFILE *infile) {
   int i;
   mngs_weapon_page weaponpage;
 
-  // See if its in memory
+  // See if it is in memory
   i = FindWeaponName(name);
   if (i != -1)
     return i;
@@ -1376,7 +1376,7 @@ int mng_AssignWeaponPageToWeapon(mngs_weapon_page *weaponpage, int n, CFILE *inf
 
   // First see if our image differs from the one on the net
   // If it is, make a copy
-  // If its a release version, don't do any of this
+  // If it is a release version, don't do any of this
 
 #ifndef RELEASE
   if (Network_up) {
@@ -1386,7 +1386,7 @@ int mng_AssignWeaponPageToWeapon(mngs_weapon_page *weaponpage, int n, CFILE *inf
     UpdatePrimitive(str / weaponpage->hud_image_name, netstr / weaponpage->hud_image_name, weaponpage->hud_image_name,
                     PAGETYPE_WEAPON, weaponpointer->name);
 
-    // Now copy the discharge image, depending on whether or not its a model
+    // Now copy the discharge image, depending on whether or not it is a model
     if (!((weaponpage->weapon_struct.flags & WF_IMAGE_BITMAP) || (weaponpage->weapon_struct.flags & WF_IMAGE_VCLIP))) {
       str = LocalModelsDir;
       netstr = NetModelsDir;
diff --git a/mem/mem.cpp b/mem/mem.cpp
index 9c0a6341..02345056 100644
--- a/mem/mem.cpp
+++ b/mem/mem.cpp
@@ -807,7 +807,7 @@ bool mem_dumpmallocstofile(char *filename) {
       mem_alloc_info *last_alloc;
       last_alloc = (mem_alloc_info *)allocs[sorted_allocs[last_unique]].data;
       if ((!strcmp(last_alloc->file, alloc_info->file)) && (last_alloc->line == alloc_info->line)) {
-        // its the same!
+        // it is the same!
         continue;
       }
     }
diff --git a/model/polymodel.cpp b/model/polymodel.cpp
index 2542b8b8..9e332c8b 100644
--- a/model/polymodel.cpp
+++ b/model/polymodel.cpp
@@ -520,7 +520,7 @@
  *
  * 29    5/16/97 1:24p Jason
  * changed the way models work their angle magic
- * Now its much more intuitive
+ * Now it is much more intuitive
  *
  * 28    5/16/97 12:04p Jason
  * better memory use for rotational keyframes
@@ -948,7 +948,7 @@ int ReloadModelTextures(int modelnum) {
         strcat(temp, ".OGF");
         ret = FindTextureBitmapName(temp);
         if (ret == -1) {
-          // See if its already in memory
+          // See if it is already in memory
           ret = FindTextureName(name_buf);
           if (ret == -1) {
             ret = 0;
@@ -1761,7 +1761,7 @@ int ReadNewModelFile(int polynum, CFILE *infile) {
 
         ret = FindTextureBitmapName(temp);
         if (ret == -1) {
-          // See if its already in memory
+          // See if it is already in memory
           ret = FindTextureName(name_buf);
           if (ret == -1) {
             ret = 0;
@@ -2146,7 +2146,7 @@ int LoadPolyModel(const std::filesystem::path &filename, int pageable) {
   return -1; // damn, didn't load
 }
 
-// Pages in a polymodel if its not already in memory
+// Pages in a polymodel if it is not already in memory
 void PageInPolymodel(int polynum, int type, float *size_ptr) {
   if (!(Poly_models[polynum].flags & PMF_NOT_RESIDENT)) {
     if (!(Poly_models[polynum].flags & PMF_SIZE_COMPUTED))
diff --git a/model/polymodel.h b/model/polymodel.h
index f9154bc4..0ab2fd3d 100644
--- a/model/polymodel.h
+++ b/model/polymodel.h
@@ -407,7 +407,7 @@ int IsNonRenderableSubmodel(poly_model *pm, int submodelnum);
 // Sets the effect used by a polymodel
 void SetPolymodelEffect(polymodel_effect *);
 
-// Pages in a polymodel if its not already in memory
+// Pages in a polymodel if it is not already in memory
 void PageInPolymodel(int polynum, int type = -1, float *size_ptr = nullptr);
 
 // Gets a pointer to a polymodel.  Pages it in if neccessary
diff --git a/netgames/dmfc/dmfcbase.cpp b/netgames/dmfc/dmfcbase.cpp
index 034bc15b..03733fb0 100644
--- a/netgames/dmfc/dmfcbase.cpp
+++ b/netgames/dmfc/dmfcbase.cpp
@@ -2422,7 +2422,7 @@ void DMFCBase::DisplayOutrageLogo(void) {
     time = 0;
   }
 
-  // draw the Outrage Logo if its time
+  // draw the Outrage Logo if it is time
   if (time < 5.0) {
     int x, y;
     x = (*Game_window_w) - bmp.pw;
@@ -3255,7 +3255,7 @@ bool DMFCBase::IsAddressBanned(network_address *addr, const char *tracker_id) {
   curr = m_AllowList;
   while (curr) {
     if ((address & curr->mask) == (curr->ip & curr->mask)) {
-      // its a match
+      // it is a match
       mprintf(0, "Player not banned\n");
       return false;
     }
@@ -3267,7 +3267,7 @@ bool DMFCBase::IsAddressBanned(network_address *addr, const char *tracker_id) {
   curr = m_DenyList;
   while (curr) {
     if ((address & curr->mask) == (curr->ip & curr->mask)) {
-      // its a match
+      // it is a match
       mprintf(0, "Player IS banned\n");
       return true;
     }
@@ -4715,7 +4715,7 @@ void ParseHostsFile(char *filename, tHostsNode **root) {
       // attempt to parse the dotted ip address (only 0-9,'.' and '*' allowed)
       char *start = ptr;
 
-      // check to make sure its in a valid form
+      // check to make sure it is in a valid form
 
       int dot_count = 0;
       while (*ptr) {
diff --git a/netgames/includes/gamedll_header.h b/netgames/includes/gamedll_header.h
index 3ec6adc6..cd082ec8 100644
--- a/netgames/includes/gamedll_header.h
+++ b/netgames/includes/gamedll_header.h
@@ -1738,7 +1738,7 @@ DMFCDLLOUT(dInven_UsePos_fp Inven_UsePos;)
 typedef int (*dInven_GetPos_fp)(Inventory *inven);
 DMFCDLLOUT(dInven_GetPos_fp Inven_GetPos;)
 
-// checks the pos, if its on a nonselectable item it will move to the next selectable (NULL if none)
+// checks the pos, if it is on a nonselectable item, it will move to the next selectable (NULL if none)
 // typedef void (*dInven_ValidatePos_fp)(Inventory *inven,bool forward=true);
 typedef void (*dInven_ValidatePos_fp)(Inventory *inven, bool forward);
 DMFCDLLOUT(dInven_ValidatePos_fp Inven_ValidatePos;)
diff --git a/netgames/monsterball/monsterball.cpp b/netgames/monsterball/monsterball.cpp
index 19d95773..eb333184 100644
--- a/netgames/monsterball/monsterball.cpp
+++ b/netgames/monsterball/monsterball.cpp
@@ -1776,7 +1776,7 @@ void GetGameStartPacket(uint8_t *data) {
   temp = (int8_t)MultiGetByte(data, &count);
   NumOfTeams = temp;
 
-  // we need to find the objnum of the Monsterball...its there somewhere
+  // we need to find the objnum of the Monsterball...it is there somewhere
   DLLmprintf(0, "Looking for Monsterball in level\n");
   int objnum = -1;
 
diff --git a/physics/collide.cpp b/physics/collide.cpp
index 1113d112..700d079b 100644
--- a/physics/collide.cpp
+++ b/physics/collide.cpp
@@ -2471,7 +2471,7 @@ void collide_two_objects(object *A, object *B, vector *collision_point, vector *
     }
   }
 
-  // Call script only if its ok to
+  // Call script only if it is ok to
   int ok_to_call_script = 1;
   if (A->type == OBJ_PLAYER && (Players[A->id].flags & (PLAYER_FLAGS_DYING | PLAYER_FLAGS_DEAD)))
     ok_to_call_script = 0;
diff --git a/scripts/AIGame.cpp b/scripts/AIGame.cpp
index 71b076f2..c2d61468 100644
--- a/scripts/AIGame.cpp
+++ b/scripts/AIGame.cpp
@@ -4918,10 +4918,10 @@ bool GuideBot::InitExtinguish(bool f_player_on_fire) {
       break;
 
     if (Obj_IsEffect(scan_objs[i], EF_NAPALMED)) {
-      //			mprintf(0, "its on fire\n");
+      //			mprintf(0, "it is on fire\n");
       if (scan_objs[i] != memory->me) {
         if (!AI_IsObjEnemy(memory->me, scan_objs[i])) {
-          //					mprintf(0, "its not a enemy\n");
+          //					mprintf(0, "it is not a enemy\n");
           memory->extinguish_obj_list[memory->num_extinguish_objs++] = scan_objs[i];
         }
       }
diff --git a/scripts/DallasFuncs.cpp b/scripts/DallasFuncs.cpp
index 38de9f4c..8e502e96 100644
--- a/scripts/DallasFuncs.cpp
+++ b/scripts/DallasFuncs.cpp
@@ -3551,7 +3551,7 @@ $$END
 void aAIFlags(int set, int flags, int handle) {
   bool f_team = false;
 
-  // Because its a bitfield, I had to hack a team value...  Team PTMC was 0; so, it was
+  // Because it is a bitfield, I had to hack a team value...  Team PTMC was 0; so, it was
   // impossible to set...  32768 wasn't used, so I hacked it here.  O' The shame...  :(
 
   if (!set)
diff --git a/scripts/data/demohog/d3.str b/scripts/data/demohog/d3.str
index 73ff8dab..388eeeb2 100644
--- a/scripts/data/demohog/d3.str
+++ b/scripts/data/demohog/d3.str
@@ -3429,7 +3429,7 @@
 !I!Sensibilità joystick %c
 !F!Sensibilité Joystick %c
 
-!/!482: In the config menus, just like joystick, its the label for the sensitivity sliders for the mouse axis
+!/!482: In the config menus, just like joystick, it is the label for the sensitivity sliders for the mouse axis
 !=!Mouse %c Sensitivity
 !G!Maus %c Empfindlichkeit
 !S!Sensibilidad ratón %c
diff --git a/scripts/data/fullhog/D3.STR b/scripts/data/fullhog/D3.STR
index 73ff8dab..388eeeb2 100644
--- a/scripts/data/fullhog/D3.STR
+++ b/scripts/data/fullhog/D3.STR
@@ -3429,7 +3429,7 @@
 !I!Sensibilità joystick %c
 !F!Sensibilité Joystick %c
 
-!/!482: In the config menus, just like joystick, its the label for the sensitivity sliders for the mouse axis
+!/!482: In the config menus, just like joystick, it is the label for the sensitivity sliders for the mouse axis
 !=!Mouse %c Sensitivity
 !G!Maus %c Empfindlichkeit
 !S!Sensibilidad ratón %c
diff --git a/scripts/data/fullhog/d3i.str b/scripts/data/fullhog/d3i.str
index 034310cb..775d1c15 100644
--- a/scripts/data/fullhog/d3i.str
+++ b/scripts/data/fullhog/d3i.str
@@ -3426,7 +3426,7 @@
 !I!Sensibilità joystick %c
 !F!Sensibilité Joystick %c
 
-!/!482: In the config menus, just like joystick, its the label for the sensitivity sliders for the mouse axis
+!/!482: In the config menus, just like joystick, it is the label for the sensitivity sliders for the mouse axis
 !=!Mouse %c Sensitivity
 !G!Maus %c Empfindlichkeit
 !S!Sensibilidad ratón %c