On 17 July 1977, 2 Ethiopian F-5 were on combat air patrol near Harer, when 4 Somali MiG-21MF were detected nearby. In the engagement, 2 MiG-21 were shot down while the other two had a mid-air collision while avoiding a AIM-9B missile. The nationality of the F-5 pilots (Israeli or Ethiopian) is disputed. The better trained Ethiopian Air Force F-5 pilots swiftly gained air superiority over the Somali Air Force, shooting down a number of aircraft, while other Somali aircraft were lost to air defense and to incidents. However at least three F-5 were shot down by air defense during attacks against supply bases in western Somalia

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