Historical accuracy? This is from a company that made NAZI ZOMBIES! Sheesh. And it's not hard to imagine that there could be a reason for using some of these weapons. Perhaps the government has kept a lid on the best weapons to only be deployed with their black operators to ensure they would always outgun their enemies. And keep in mind this is a post MW2 age we live in. You need a bunch of guns and they all need a different 'feel' to them, to keep the repeated playing interesting. If you did more research, you would have found that a majority of the weapons used in Vietnam were the same as used in WWII. M1911, M1 Carbine, Thompson Machine Gun, Springfield, and M1 Garand were all used in Vietnam. Also in every other COD. I'm glad for the variety of weapons to choose from, even if it isn't perfectly accurate.