An F-16 Fighting Falcon crew chief assigned to the 555th Aircraft Maintenance Unit performs maintenance on a U.S. Air Force 555th Fighter Squadron F-16 during exercise Thracian Star 21 at Graf Ignatievo Air Base, Bulgaria, July 9, 2021. Thracian Star 21 is a multilateral training exercise with the Bulgarian air force that increases operational capacity, capability and interoperability with Bulgaria. (U.S. Air Force photo by Airman 1st Class Brooke Moeder)
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