The M60 is a type of American-made machine gun. The M60 fires 7.62mm NATO cartridges. The cartridges are fed into the gun using a belt. The United States Army started to use the M60 in 1957. It has been used by all the branches of the U.S. military. The United States Army used the M60 during the Vietnam War, Gulf War, Afghanistan War and the Iraq War. Recently, the U.S. military has started to replace the M60 with the M240 machine gun.