Senior Airman Cora Allen, 28th Maintenance Squadron aerospace maintenance technician, inspects the hydraulic service plate under a B-1 during an isochronal inspection at Ellsworth Air Force Base, S.D., Jan. 15, 2013. The isochronal inspection shop disassembles the aircraft and inspects all critical systems after a specificed number of flight hours, or if the aircraft is having technical issues. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released) )