McDonnell Douglas XF4H-1 & F4A Phantom II

On 25th July 1955 the United States Navy ordered two XF4H-1 prototypes, and it made it's maiden flight on 27th May 1958 manned by Robert C. Little. There was a problem with the hydraulics systems at the first flight, but it was quickly solved and everything went smoothly. After the first tests, the air intakes were redesigned in order to work better.
It quickly squared off against the Vought XF8U-3 Crusader and, due to operator workload, the Navy wanted a two-seater aircraft, so on 17th December 1958 the F4H was declared as winner.
Considering the limited availability of the J79-GE-8 engines, the first production aircrafts were fitted with the J79-GE-2 and -2A engines delivering each of them 16100lbf (71.8Kn) of afterburning thrust. In 1959 it began carrier sustainability trials on board USS Independence (CV-62) that were fully completed on 15th February 1960.
There were proposals to nickname it as F4H "Satan" or F4H "Mithras", but, as they were controversial names, it was decided to nickname it "Phantom II".

Sources:
1. https://en.wikipedia.org/wiki/McDonnell_Douglas_F-4_Phantom_II#XF4H-1_prototype
2. Salamander Books - The Complete Book of Fighters