Staff Writer (Updated: 4/18/2016):
By 1972 the United States Air Force was already showcasing its F-111 swing-wing bombers throughout the skies over Vietnam. Seeing the potential for replacing the EB-66 conversion models, the USAF tabbed some F-111A models to be converted themselves into the EF-111, taking on the designation name of "Raven" in the process. These new systems would adopt state-of-the-art technologies to help other aerial battlefield components fight more effectively and accurately. Grumman proceeded on the conversion plans under a new USAF contract in 1974 with first flight achieved by a Raven in 1977. Deliveries would start four years later.
EF-111's were deployed in operational combat use against Libya, Panama, in the Persian Gulf War and Bosnia/Herzegovina with no aircraft lost to enemy fire. From there, the Ravens would be deployed near US interests worldwide for a time up until 1998 to which the EF-111's would be officially retired from USAF service. By any regard, the EF-111 ended up looking quite similar to her strike counterpart with the exception of bulge on the top of the vertical tail fin. Some 42 F-111A Aardvark models were eventually converted to EF-111 Ravens.
The EF-111 also gained the nickname of "Spark Vark" during its tenure and was also known for a time as the "Electric Fox".