Senior Airman James Chazotte, 28th Maintenance Squadron aircraft metal technology apprentice, replaces a hydraulic line on A B-1B during an isochronal inspection at Ellsworth Air Force Base, S.D., Feb. 8, 2012. The isochronal inspection shop disassembles the aircraft and inspects all critical systems after a specified number of flight hours, or if the aircraft is having technical issues. (U.S. Air Force photo by Airman Alystria Maurer/Released)