Carrying a guitar and a M16 rifle, a Marine waits at a landing strip for a flight out of Khe Sanh, February 25th, 1968. It was the era of Rock & Roll and more people turned up for James Brown at the yearly USO extravaganza, than for Bob Hope.
Early model M16 rifle, as used by US AF, with early military issue 20-round magazine. Note the three-prong flash hider and the lack of forward assist
Knights Armament SR25 The SR-25 (Stoner Rifle-25) is a designated marksman rifle designed by Eugene Stoner and manufactured by Knight's Armament Company. The SR-25 uses a rotating bolt and a direct impingement gas system. It is loosely based on Stoner's AR-10, rebuilt in its original 7.62×51mm NATO caliber. Up to 60% of parts of the SR-25 are interchangeable with the AR-15 and M16—everything but the upper and lower receivers, the hammer, the barrel assembly and the bolt carrier group. SR-25…
An American soldier presents his early Colt Automatic Rifle-15 (CAR-15) XM177E1 Commando Model 609 for a snapshot in Vietnam, via Corbis. Note its telescoping rear stock, round forestock, forward-assist, shorter barrel, heavier flash suppressor, and lack of an ejected case deflector. The CAR-15 military weapons system was a family of the AR-15 and M16 rifles marketed by Colt in the late 1960s and early 1970s.