M16a1
was adopted in 1964 and used by sog(studies and observations group) units, green berets, and other special forces units. Later it became the standard rifle for all branches of the military and variants are still used today.
M14
M2 Carbine
M60
M3 Submachine gun (Grease Gun)
1903 Springfield
the 1903a4 and 1903a5 version Used as a sniper early in the war.