I am a bit older than you guys, but I can remember that back in WWII there were some pretty severe penalties for enemy combatants wearing American military uniforms.
German commandos captured in American uniform are prepared for execution, 1944
http://rarehistoricalphotos.com/german-commandos-captured-american-uniform-1944/
Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!