Jeremy Luder, Boeing structural mechanic, repairs a cracked hole underneath a B-1 bomber’s wing during a time compliance technical order inspection at Ellsworth Air Force Base, S.D., Jan. 23, 2013. TCTOs provide instructions to modify military systems or commodities within specified time limits, initiate special one-time inspections, or impose temporary restrictions and track configuration on systems or equipment. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)