Later in the 1970s, the IIAF became the only military force other than the United States Navy to be equipped with the F-14 Tomcat. Consequently, it also became the only other operator of the AIM-54 Phoenix air-to-air missile. After the 1979 Iranian revolution, some of these planes were not in working order due to a lack of necessary spare parts, because of an American arms embargo and damage sustained on the aircraft during the Iraqi invasion (Iran–Iraq War). Some were brought back into service, due to localised production of reverse-engineered, Iranian-made, spare parts, as well as "cannibalism" (the process of taking working parts from damaged aircraft and using them to repair others).