The Concerned Officers Movement (COM) was an organization of mainly junior officers formed within the U.S. military in the early 1970s whose principal purpose was opposition to the U.S. involvement in the Vietnam War. Very quickly, however, it also found itself fighting for First Amendment rights within the military. It was initiated in the Washington, D.C. area by commissioned officers who were also Vietnam Veterans, but rapidly expanded throughout all branches and many bases of the U.S. military, ultimately playing an influential role in the opposition to the Vietnam War.