I am not a scientist.I’m definitely not a scientist. I’m a warfighter. And what I carry into battle today is not much different than what I carried when I entered the army in 1993. The M4 rifle is slightly updated from the one I carried in 1995. The 5.56 mm rounds or 7.62 mm ammo belt is Vietnam vintage. The entrenching tool, weapon magazines, knives, flashlights, poncho, and boots are for the most part exactly the same.