Senior Airman James Earnst, 37th Aircraft Maintenance Unit communication, navigation and mission systems journeyman, removes the radar altimeter control panel of a B-1 bomber for inspection during regular maintenance at Ellsworth Air Force Base, S.D., Dec. 3, 2014. Communication, navigation and mission systems Airmen routinely troubleshoot and repair various systems in the bomber to ensure the pilots are able to communicate with forces on the ground to effectively execute the. (U.S. Air Force photo by Senior Airman Hailey R. Staker/Released)