Index: fs2_open/code/ship/ship.cpp
===================================================================
--- fs2_open/code/ship/ship.cpp    (revision 8574)
+++ fs2_open/code/ship/ship.cpp    (working copy)
@@ -4969,6 +4969,10 @@ void ship_set(int ship_index, int objnum, int ship_type)
 	// corkscrew missile stuff
 	shipp->next_corkscrew_fire = 1;
 
+	// Missile bank indexes to avoid firing different swarm/corkscrew missiles
+	shipp->swarm_missile_bank = -1;
+	shipp->corkscrew_missile_bank = -1;
+
 	// field for score
 	shipp->score = sip->score;
 
@@ -10580,8 +10584,16 @@ int ship_fire_secondary( object *obj, int allow_swarm )
 
 	num_fired = 0;		// tracks how many missiles actually fired
 
-	bank = swp->current_secondary_bank;
-	if ( bank < 0 ) {
+	// niffiwan: allow swarm/corkscrew bank to keep firing if current bank changes
+	if (shipp->swarm_missile_bank != -1 && allow_swarm) {
+		bank = shipp->swarm_missile_bank;
+	} else if (shipp->corkscrew_missile_bank != -1 && allow_swarm) {
+		bank = shipp->corkscrew_missile_bank;
+	} else {
+		bank = swp->current_secondary_bank;
+	}
+
+	if ( bank < 0 || bank > sip->num_secondary_banks ) {
 		return 0;
 	}
 
@@ -10624,7 +10636,8 @@ int ship_fire_secondary( object *obj, int allow_swarm )
 		return 0;
 	}
 
-	if ( swp->current_secondary_bank < 0 ){
+	// niffiwan: 04/03/12: duplicate of a check approx 100 lines above - not needed?
+	if ( bank < 0 ){
 		return 0;
 	}
 
@@ -10702,10 +10715,11 @@ int ship_fire_secondary( object *obj, int allow_swarm )
 	if ( (wip->wi_flags & WIF_SWARM) && !allow_swarm ) {
 		Assert(wip->swarm_count > 0);
 		if(wip->swarm_count <= 0){
-			shipp->num_swarm_missiles_to_fire += SWARM_DEFAULT_NUM_MISSILES_FIRED;
+			shipp->num_swarm_missiles_to_fire = SWARM_DEFAULT_NUM_MISSILES_FIRED;
 		} else {
-			shipp->num_swarm_missiles_to_fire += wip->swarm_count;
+			shipp->num_swarm_missiles_to_fire = wip->swarm_count;
 		}
+		shipp->swarm_missile_bank = bank;
 		return 1;		//	Note: Missiles didn't get fired, but the frame interval code will fire them.
 	}
 
@@ -10713,7 +10727,8 @@ int ship_fire_secondary( object *obj, int allow_swarm )
 	if ( (wip->wi_flags & WIF_CORKSCREW) && !allow_swarm ) {
 		//phreak 11-9-02 
 		//changed this from 4 to custom number defined in tables
-		shipp->num_corkscrew_to_fire = (ubyte)(shipp->num_corkscrew_to_fire + (ubyte)wip->cs_num_fired);		
+		shipp->num_corkscrew_to_fire = (ubyte)(shipp->num_corkscrew_to_fire + (ubyte)wip->cs_num_fired);
+		shipp->corkscrew_missile_bank = bank;
 		return 1;		//	Note: Missiles didn't get fired, but the frame interval code will fire them.
 	}	
 
@@ -10875,8 +10890,8 @@ int ship_fire_secondary( object *obj, int allow_swarm )
 		if ( Weapon_info[weapon].launch_snd != -1 ) {
 			snd_play( &Snds[Weapon_info[weapon].launch_snd], 0.0f, 1.0f, SND_PRIORITY_MUST_PLAY );
 			swp = &Player_ship->weapons;
-			if (swp->current_secondary_bank >= 0) {
-				wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
+			if (bank >= 0) {
+				wip = &Weapon_info[swp->secondary_bank_weapons[bank]];
 				if (Player_ship->flags & SF_SECONDARY_DUAL_FIRE){
 					joy_ff_play_secondary_shoot((int) (wip->cargo_size * 2.0f));
 				} else {
@@ -10933,10 +10948,12 @@ done_secondary:
 
 		if (shipp->num_swarm_missiles_to_fire > 1) {
 			shipp->num_swarm_missiles_to_fire = 1;
+			shipp->swarm_missile_bank = -1;
 		}
 
 		if (shipp->num_corkscrew_to_fire > 1) {
 			shipp->num_corkscrew_to_fire = 1;
+			shipp->corkscrew_missile_bank = -1;
 		}
 	}
 
@@ -10954,8 +10971,8 @@ done_secondary:
 	//then it would have no firedelay. and then add 250 ms of delay. in effect, this way there is no penalty if there is any firedelay remaning in
 	//the next valid bank. the delay is there to prevent things like Trible/Quad Fire Trebuchets.
 	//
-	// niffiwan: only try to switch banks if object has multiple banks
-	if ( (obj->flags & OF_PLAYER_SHIP) && (swp->secondary_bank_ammo[bank] <= 0) && (swp->num_secondary_banks >= 2) ) {
+	// niffiwan: only try to switch banks if object has multiple banks, and firing bank is the current bank
+	if ( (obj->flags & OF_PLAYER_SHIP) && (swp->secondary_bank_ammo[bank] <= 0) && (swp->num_secondary_banks >= 2) && (bank == swp->current_secondary_bank) ) {
 		// niffiwan: call ship_select_next_secondary instead of ship_select_next_valid_secondary_bank
 		// ensures all "extras" are dealt with, like animations, scripting hooks, etc
 		if (ship_select_next_secondary(obj) ) {			//DTP here we switch to the next valid bank, but we can't call weapon_info on next fire_wait
Index: fs2_open/code/ship/ship.h
===================================================================
--- fs2_open/code/ship/ship.h    (revision 8574)
+++ fs2_open/code/ship/ship.h    (working copy)
@@ -508,6 +508,7 @@ typedef struct ship {
 	char targeting_laser_bank;						// -1 if not firing, index into polymodel gun points if it _is_ firing
 	// corkscrew missile stuff
 	ubyte num_corkscrew_to_fire;						// # of corkscrew missiles lef to fire
+	int corkscrew_missile_bank;
 	// END PACK
 
 	// targeting laser info
@@ -614,6 +615,7 @@ typedef struct ship {
 	int	next_swarm_fire;					// timestamp of next swarm missile to fire
 	int	next_swarm_path;					// next path number for swarm missile to take
 	int	num_turret_swarm_info;			// number of turrets in process of launching swarm
+	int swarm_missile_bank;				// The missilebank the swarm was originally launched from
 
 	int	group;								// group ship is in, or -1 if none.  Fred thing
 	int	death_roll_snd;					// id of death roll sound, may need to be stopped early	
Index: fs2_open/code/weapon/corkscrew.cpp
===================================================================
--- fs2_open/code/weapon/corkscrew.cpp    (revision 8574)
+++ fs2_open/code/weapon/corkscrew.cpp    (working copy)
@@ -78,22 +78,24 @@ void cscrew_maybe_fire_missile(int shipnum)
 
 	// make sure we're supposed to be firing some missiles
 	if ( sp->num_corkscrew_to_fire <= 0 ){
+		sp->corkscrew_missile_bank = -1;
 		return;
 	}
 
-	// make sure we have a valid weapon band
+	// make sure we have a valid weapon bank
 	swp = &sp->weapons;
-	if ( swp->current_secondary_bank == -1 ) {
+	if ( sp->corkscrew_missile_bank == -1 ) {
 		sp->num_corkscrew_to_fire = 0;
 		return;
 	}
 
-	weapon_info_index = swp->secondary_bank_weapons[swp->current_secondary_bank];
+	weapon_info_index = swp->secondary_bank_weapons[sp->corkscrew_missile_bank];
 	Assert( weapon_info_index >= 0 && weapon_info_index < MAX_WEAPON_TYPES );
 
 	// if current secondary bank is not a corkscrew missile, return
 	if ( !(Weapon_info[weapon_info_index].wi_flags & WIF_CORKSCREW) ) {
 		sp->num_corkscrew_to_fire = 0;
+		sp->corkscrew_missile_bank = -1;
 		return;
 	}
 
Index: fs2_open/code/weapon/swarm.cpp
===================================================================
--- fs2_open/code/weapon/swarm.cpp    (revision 8574)
+++ fs2_open/code/weapon/swarm.cpp    (working copy)
@@ -96,21 +96,24 @@ void swarm_maybe_fire_missile(int shipnum)
 	Assert(shipnum >= 0 && shipnum < MAX_SHIPS );
 	sp = &Ships[shipnum];
 
-	if ( sp->num_swarm_missiles_to_fire <= 0 )
+	if ( sp->num_swarm_missiles_to_fire <= 0 ) {
+		sp->swarm_missile_bank = -1;
 		return;
+	}
 
 	swp = &sp->weapons;
-	if ( swp->current_secondary_bank == -1 ) {
+	if ( sp->swarm_missile_bank == -1 ) {
 		sp->num_swarm_missiles_to_fire = 0;
 		return;
 	}
 
-	weapon_info_index = swp->secondary_bank_weapons[swp->current_secondary_bank];
+	weapon_info_index = swp->secondary_bank_weapons[sp->swarm_missile_bank];
 	Assert( weapon_info_index >= 0 && weapon_info_index < MAX_WEAPON_TYPES );
 
-	// if current secondary bank is not a swarm missile, return
+	// if swarm secondary bank is not a swarm missile, return
 	if ( !(Weapon_info[weapon_info_index].wi_flags & WIF_SWARM) ) {
 		sp->num_swarm_missiles_to_fire = 0;
+		sp->swarm_missile_bank = -1;
 		return;
 	}