In WWII, Croats and Muslims were American enemies and Chetniks were American allies.
Gen Draza Mihajlovich was posthumously awarded The Congressional medal of Honor for saving over 500 American pilots behind enemy lines. Croat and Bosnian Usashas saved none but shot down over 200 USSAF planes. No wonder they still hated Chetniks.
I guess that Jewish NEVER AGAIN is also "exhibit A of this sad reality" to you.
US ARMY in Iraq has much better logistics than BSA had during the war. Americans drive around in Humvees with DIY armor plating of various color, not drab olive. In war, one use what he can find. Finding paint for vehicle paint job was not BSA priority.
Bosnian Muslims also used ammo with Yugoslav markings. According to your logic, Yugoslavia was arming Bosnian Muslims.
It seems that you have not heard of UNPROFOR checkpoints on Bosnia border otherwise you would not claim that "arrived from Serbia throughout the war."