Brief History (Exerpts from Wikipedia)
The McDonnell Douglas F-4 Phantom II is a two-seat, twin engine, all-weather, long-range supersconic jet fighter-bomber and interceptor originally developed for the United States Navy by McDonald Aircraft. It first entered service in 1960 with the Navy. Proving highly adaptable, it was also adopted by the United States Marine Corps and the United States Air Force, and by the mid-1960s had become a major part of their air arms.
The Phantom is a large fighter with a top speed of over Mach 2.2. It can carry more than 18,000 pounds of weapons on nine external hardpoints, including air-to-air missiles,air-to-ground missiles, and various bombs. The F-4, like other interceptors of its time, was initially designed without an internal cannon. Later models incorporated an M16 Vulcan rotary cannon. Beginning in 1959, it set 15 world records for in-flight performance, including an absolute speed record and an absolute altitude record.