Awww... come on everybody. Any basic trainee knows that the only knife really designed as a weapon is a bayonet. Remember such touching shouts as "Sergeant: the red, red blood makes the grass grow green!" and "what is the spirit of the bayonet? to KILL, to KILL, and TO KILL WITHOUT MERCY". If you're diving with a bayonet and a rifle - you have a weapon... otherwise you have a tool. One of the things I never could get my head around was "if you bayonet the enemy and your bayonet is stuck (like in their sternum), squeeze off a round and let the kick of the rifle help you remove the bayonet." This is totally illogical! If you had a round in the weapon, why in the name of God would you bayonet somebody???
Of course, that was in 1968, and things may have changed since then