The Stop Our Ship (SOS) movement, a component of the overall civilian and GI movements against the Vietnam War, was directed towards and developed on board U.S. Navy ships, particularly aircraft carriers heading to Southeast Asia. It was concentrated on and around major U.S. Naval stations and ships on the West Coast from mid-1970 to the end of the Vietnam War in 1975, and at its height involved tens of thousands of antiwar civilians, military personnel and veterans. It was sparked by the tactical shift of U.S. combat operations in Southeast Asia from the ground to the air. As the ground war stalemated and Army grunts increasingly refused to fight or resisted the war in various other ways, the U.S. “turned increasingly to air bombardment”. By 1972 there were twice as many Seventh Fleet air