“Development of the Phantom II began in 1953 when McDonnell began studying concepts for an all-weather naval strike fighter to replace the USN F3H Demon. The Demon was a starting point for the Phantom II studies with evolutionary growth variants of the later leading to the un-built F3H-(C), which was a 1953 proposal of an enlarged version of the F3H-2 to be powered by the J67-W-1 engine to produce a so called Super Demon. Further design studies led to the un-built F3H-(E) single seat, single engine fighter based on the Demon.””
F-4 Phantom II in USAF Service
