Derrick Brown, 28th Aircraft Maintenance Squadron contract field team engine mechanic, removes an access panel on a B-1 during a home station maintenance check at Ellsworth Air Force Base, S.D., Jan. 22, 2013. The panel was removed to inspect the wheel auxiliary power unit area for leaks, wear and tear and missing hardware. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)