The McDonnell Douglas F-4 Phantom II[N 1] is an American tandem two-seat, twin-engine, all-weather, long-range supersonic jet interceptor and fighter-bomber originally developed by McDonnell Aircraft for the United States Navy.[2] Proving highly adaptable, it entered service with the Navy in 1961[3] before it was adopted by the United States Marine Corps and the United States Air Force, and by the mid-1960s it had become a major part of their air arms.[4] Phantom production ran from 1958 to 1981 with a total of 5,195 aircraft built, making it the most produced American supersonic military aircraft in history, and cementing its position as a signature combat aircraft of the Cold War.[4][5]