Kelly Kowaleski, 28th Aircraft Maintenance Squadron contract field team hydraulics specialist, replaces a wing bearing on a B-1 at Ellsworth Air Force Base, S.D., Sept. 11, 2013. The bearings which allow for a smooth transition as the wings are swept back and forth are replaced every 150 days during home station maintenance checks. (U.S. Air Force photo by Airman 1st Class Rebecca Imwalle/Released)