In the early 1950s, McDonnell Aircraft began work on a revised design of their F3H Demon naval fighter, in an effort to expand upon its capabilities and improve performance in general. By September 1953, the design was submitted for Navy consideration. Showing interest in the project, the U.S. Navy ordered the construction of a mock-up and expressed interest in potentially procuring the type.

By 1955 however, the U.S. Navy changed the requirements for the aircraft substantially. Instead of a multipurpose aircraft, the new design was now supposed to act as a two-seat, long-range, all-weather fleet interceptor. Having revised the design, orders were issued for the construction of two XF4H-1 prototypes as well as an additional five pre-production F4H-1s. Following comparative testing against other machines in service with the Navy at the time, the F4H proved itself as highly capable aircraft and was thus ordered into full-scale production as the F-4. The name ‘Phantom II’ was given to the aircraft at McDonnell’s 20th anniversary celebration in July 1959.

Some time after the Navy procured the F-4, other branches of the U.S. military also became interested in the aircraft. A result, the USAF also introduced a special “army” version of the F-4 into service during the mid 1960s under the designation F-4C.

The F-4 Phantom II would become one of the most produced and widely used American combat aircraft of the second half of the 20th century. With over 5,100 machines being built, the F-4 Phantom II saw service with several operators around the globe and remained in service until the 1990s, while some still serve to this day. Phantom II is widely known as a symbol of the US campaign in Vietnam, in particular.