During Vietnam, there were a lot of weapons floating around - the M-14, firing the 7.62X54 (.308) round, the AK-47, firing the 7.62X39 round, and the M-16, firing the NATO .223 round. Subsequently, the Russian Army adopted the smaller, faster bullet, with the AK-74, firing the 5.54X39 round. I was Navy, working with the SEALS and Marine LRRP (what is now called "SWCC", tho' we had no special name at the time). The SEALS had the option of choosing their weapons and, invariably, chose either the AK-47, both because of its reliability and to leave a smaller "footprint", or the HK-91, firing th