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U.S. Air Force Staff Sgt. Joseph Gallegos, 309th Aircraft Maintenance Group depot structural maintenance specialist, inspects the bulkhead of an F-16 Fighting Falcon with liquid nitrogen at Kunsan Air Base, Republic of Korea, Nov. 8, 2018. Due to normal wear and tear after years of flying and performing combat and training operations, the bulkhead had to be replaced in order to maintain the F-16 Fighting Falcon’s lethality.