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In page Mikoyan-Gurevich MiG-21:

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Libyan MiG-21s saw limited service during the 2011 Libyan civil war.[citation needed] On 15 March 2011, one MiG-21bis and one MiG-21UM flown by defecting Libyan Air Force pilots flew from Ghardabiya Airbase near Sirte to Benina Airport to join the rebellion's Free Libyan Air Force. On 17 March 2011, the MiG-21UM experienced a technical fault and crashed after taking off from Benina.[1]