diff --git a/port/linux/game/network_coop.c b/port/linux/game/network_coop.c
index 50421dbd..9e38dd31 100644
--- a/port/linux/game/network_coop.c
+++ b/port/linux/game/network_coop.c
@@ -73,6 +73,7 @@ index and tag, since the map placed them at the same index everywhere.
 #include "effects/effect_definitions.h"
 #include "effects/player_effects.h"
 #include "game/game.h"
+#include "game/game_allegiance.h"
 #include "game/game_engine.h"
 #include "game/players.h"
 #include "game/player_queues_new.h"
@@ -272,6 +273,10 @@ struct distributed_coop_presentation
 	byte pad[2];
 	real players_maximum_body_vitality;
 	real players_maximum_shield_vitality;
+	/* which teams are allies and friends (game_allegiance.c): the scripts
+	make them, so a client's would leave the marines its enemies */
+	unsigned long ally_teams[GAME_ALLEGIANCE_BITVECTOR_LONGS];
+	unsigned long friendly_teams[GAME_ALLEGIANCE_BITVECTOR_LONGS];
 };
 
 struct distributed_coop_presentation_message
@@ -1422,6 +1427,7 @@ static void host_presentation(
 	presentation->players_vitality_set = (byte)players_vitality.set;
 	presentation->players_maximum_body_vitality = players_vitality.maximum_body;
 	presentation->players_maximum_shield_vitality = players_vitality.maximum_shield;
+	game_allegiance_get_teams(presentation->ally_teams, presentation->friendly_teams);
 	SET_FLAG(presentation->flags, _presentation_skippable_bit, skip_vote.offered);
 	presentation->skip_votes = (byte)MIN(skip_vote.votes, 255);
 	presentation->skip_voters = (byte)MIN(skip_vote.voters, 255);
@@ -2853,6 +2859,7 @@ static void client_presentation_apply(
 		players_vitality.maximum_body = presentation->players_maximum_body_vitality;
 		players_vitality.maximum_shield = presentation->players_maximum_shield_vitality;
 	}
+	game_allegiance_set_teams(presentation->ally_teams, presentation->friendly_teams);
 	if (!presentation->scripted_shake && player_effect_port_scripted_active())
 		player_effect_port_scripted_end();
 
diff --git a/source/game/game_allegiance.c b/source/game/game_allegiance.c
index 15f2e970..4421b65f 100644
--- a/source/game/game_allegiance.c
+++ b/source/game/game_allegiance.c
@@ -88,8 +88,8 @@ struct game_allegiance_globals
 	short allegiance_count;
 	struct game_allegiance_record allegiances[8];
 	byte reserved92[2];
-	unsigned long ally_bitvector[4];
-	unsigned long friendly_bitvector[4];
+	unsigned long ally_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS];
+	unsigned long friendly_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS];
 };
 
 typedef char game_allegiance_record_size_assert[
@@ -452,6 +452,28 @@ void game_allegiance_update(
 	return;
 }
 
+/* port: which teams are allies and which friends. A co-op client takes the
+host's, as only the host runs the scripts that make allegiances. */
+void game_allegiance_get_teams(
+	unsigned long ally_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS],
+	unsigned long friendly_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS])
+{
+	csmemcpy(ally_bitvector, game_allegiance_globals->ally_bitvector,
+		sizeof(game_allegiance_globals->ally_bitvector));
+	csmemcpy(friendly_bitvector, game_allegiance_globals->friendly_bitvector,
+		sizeof(game_allegiance_globals->friendly_bitvector));
+}
+
+void game_allegiance_set_teams(
+	unsigned long const ally_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS],
+	unsigned long const friendly_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS])
+{
+	csmemcpy(game_allegiance_globals->ally_bitvector, ally_bitvector,
+		sizeof(game_allegiance_globals->ally_bitvector));
+	csmemcpy(game_allegiance_globals->friendly_bitvector, friendly_bitvector,
+		sizeof(game_allegiance_globals->friendly_bitvector));
+}
+
 void game_allegiance_create(
 	short team1_index,
 	boolean team1_suspicious,
diff --git a/source/game/game_allegiance.h b/source/game/game_allegiance.h
index e607caeb..fbbe2ab4 100644
--- a/source/game/game_allegiance.h
+++ b/source/game/game_allegiance.h
@@ -11,6 +11,9 @@ enum
 	_allegiance_incident_forgive
 };
 
+/* port: the longs of game_allegiance_get_teams' bit vectors */
+#define GAME_ALLEGIANCE_BITVECTOR_LONGS 4
+
 /* ---------- prototypes/GAME_ALLEGIANCE.C */
 
 void game_allegiance_initialize(
@@ -23,6 +26,12 @@ void game_allegiance_dispose_from_old_map(
 	void);
 void game_allegiance_update(
 	void);
+void game_allegiance_get_teams(
+	unsigned long ally_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS],
+	unsigned long friendly_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS]);
+void game_allegiance_set_teams(
+	unsigned long const ally_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS],
+	unsigned long const friendly_bitvector[GAME_ALLEGIANCE_BITVECTOR_LONGS]);
 void game_allegiance_create(
 	short team1_index,
 	boolean team1_suspicious,