The versatile "swing wing" F-111, unofficially named the "Aardvark," entered the USAF inventory in 1967. The F-111 can exceed twice the speed of sound (Mach 2) by sweeping its wings rearward while in flight. The wings are swept forward for takeoffs, landings, or slow speed flight.
The F-111 was a long range, all-weather attack aircraft with an advanced bomb/navigation system allowing it to strike targets deep within enemy territory, day or night. It was the first variable-geometry aircraft to enter service, and it’s variable sweep wings can move from 16 to 72.5 degrees, allowing the aircraft to operate from short, rough airfields, yet fly at supersonic speeds. It had been intended to be used by all services, including the Navy, but it was never accepted for them.
The F-111 first saw combat in Vietnam, and was the type of aircraft that made the raid on Libya, flying from bases in England. It had nuclear capability. It also saw combat in the Gulf War. Most versions were primarily fighter/bombers, but the EF-111A Raven, or "Spark Vark" version, was an electronic warfare aircraft, used to jam and confuse enemy radar. Others were used for photo reconnaissance.