After the attack on Mosul Airbase, another 50 F-5Es were dispatched to strike Nasiriyah Airbase, which was heavily damaged. As all 148 Iranian F-4s and F-5s had been sent for a bombing raid on Iraq, 60 F-14 Tomcats were scrambled to defend Iranian airspace against a possible Iraqi retaliation. Iranian F-14s managed to down 2 Iraqi MiG-21s (1 MiG-21RF and 1 MiG-21MF) and 3 Iraqi MiG-23s (MiG-23MS), an Iranian F-5E also shot down an Iraqi Su-20 during the operation. Iraqi MiG-23s managed to down 2 F-5Es, while Iraqi MiG-21s also downed 2 F-5Es. Iraqis also by mistake shot down one of their own Il-76MD strategic airlifters with a SA-3 SAM. The Iraqis however were well prepared for the attack and had flown over most of their air force to other Arab countries, such as Saudi Arabia, this made sure that most of the Iraqi Air Force survived the operation. Saddam Hussein and the Iraqi military were dealt a heavy blow when Iranian Air Force vulnerabilities failed to materialize. All Iraqi airbases near Iran were out of order for weeks and, according to Iran, Iraq's aerial efficiency was reduced by 55%. This allowed Iranians to regroup and prepare for the upcoming Iraqi invasion. Although the readiness rates of the IRIAF significantly increased in the following months, its overall role and influence declined, as the clerical government prioritized resources for the Islamic Revolutionary Guard Corps (IRGC) militias and simultaneously attempted to develop a separate air arm for this service. After the successful liberation of most Iranian areas captured by the Iraqis in the first half of 1982, the situation of the IRIAF changed completely. From an air arm that was offensive by nature, it was largely relegated to air defense and relatively infrequent bombing attacks against targets of industrial and military significance inside Iraq. Simultaneously, the IRIAF had to learn how to maintain and keep operational its large fleet of U.S.-built aircraft and helicopters without outside help, due to American sanctions. Relying primarily on antiquated equipment purchased from the US in the 1970s, the Iranians began establishing their own aerospace industry; their efforts in this remained largely unrecognized until recently. During 1984 and 1985, the IRIAF found itself confronted by an ever-better organized and equipped opponent, as the Iraqi Air force—reinforced by deliveries of advanced fighter-bombers from France and the Soviet Union—launched numerous offensives against Iranian air bases, military bases, industrial infrastructures, powerplants, oil-export hubs, and population centers.