Pratt & Whitney's TF30 was the first dual-spool, afterburning turbofan engine to enter service with the military. The program was launched in 1959 to develop a military engine with afterburning for sustained supersonic speeds. The first flight of the engine, designated TF30 by the military, was on December 21, 1964, in a twin-engine General Dynamics F-111A being developed for the Air Force.