One of the most famous and easily recognized fighter aircraft of the post-WWII era was the McDonnell F-4 Phantom II. This aircraft was developed as a private venture by the aircraft company but was soon ordered by the USN as a carrier-based attack aircraft. Its first flight took place on May 27, 1958 and it entered active service in December 1960. It wasn’t long after the F-4B appeared that a fly-off was set up with USAF front-line fighters. It was no contest, the F-4 performed so well that the USAF ordered their own variant, the F-4C. As time went on, the F-4 evolved into well over a dozen variants.