This video hows virtually all the weapons and ammunition used by the US Army in WWII. 30 cal. carbine, 30 cal. machine gun, 50 cal. machine gun, hand grenades, rifle grenades, anti tank grenades, anti tank rockets, 60mm mortar, 81mm mortar, 37mm armor piercing rounds, etc. Starts with a 45mm pistol and how it works on a German helmet. A very cool video to watch, it comes in two parts.