The F-111, which ultimately proved to be a very capable fighter-bomber for the US and Australian Air Forces, was born out of the desire of Secretary of Defense Robert Strange McNamara to force the USAF and the Navy to use a single aircraft for all tactical missions strike, close air support, air superiority and fleet air defense.
The initial effort, called the Tactical Fighter Experimental, or TFX, was based largely on the Air Forces requirements, with a few adaptations to approximate the Nav.
The F-111, which ultimately proved to be a very capable fighter-bomber for the US and Australian Air Forces, was born out of the desire of Secretary of Defense Robert Strange McNamara to force the USAF and the Navy to use a single aircraft for all tactical missions strike, close air support, air superiority and fleet air defense