The M14 was the standard infantry rifle for all Army and Marine units that deployed to Vietnam in 1965, but Defense Secretary Robert McNamara ended procurement in 1964, selecting the M16 as a replacement. By 1970, only a handful of M14s remained in Vietnam.
Army leaders are building a Next Generation Squad Weapon rather than field the M27, a rifle Marines have adopted as their Squad Automatic Weapon replacement and as a designated marksman rifle.