Participation in humanitarian operations has also been a recurring theme. Air Combat Command supported the humanitarian efforts of the United States Air Forces in Europe (USAFE), deploying active duty and air reserve component forces to Provide Promise and Deny Flight in Eastern Europe and Operation Provide Comfort out of Incirlik AB, Turkey. Provide Promise offered humanitarian relief airlift support to the city of Sarajevo, while Deny Flight enforced the "no-fly" zone against Serb air attacks on Bosnian civilians. Operation Provide Comfort, another humanitarian operation, also provided relief to Kurdish inhabitants of northern Iraq who had undergone fierce repression by the Iraqi government.