Staff Sgt. Lesner Dimaoala, 7th Aircraft Maintenance Squadron crew chief, services engine oil on a B-1B Lancer aircraft during a Bomber Agile Combat Employment exercise at Naval Air Station Fort Worth Joint Reserve Base, Texas, December 12, 2019. The B-1B Lancer aircraft completed multiple training sorties during the exercise to test the personnel’s capabilities to complete the mission in potentially austere locations. (U.S. Air Force photo by Staff Sgt. David Owsianka)