Following the overthrow of the Shah in 1979, the air force was renamed the Islamic Republic of Iran Air Force (IRIAF) and the post-revolution Interim Government of Iran canceled most Western arms orders. In 1980, an Iranian F-14 shot down an Iraqi Mil Mi-25 helicopter for its first air-to-air kill during the Iran–Iraq War (1980–1988). According to research by Tom Cooper, Iranian F-14s scored at least 50 air-to-air victories in the first six months of the war against Iraqi MiG-21s, MiG-23s, and some Su-20s/22s. During the same period, only one Iranian F-14 suffered damage after being hit by debris from a nearby MiG-21 that exploded.