Airman 1st Class Jeffrey Merrill, 28th Aircraft Maintenance Squadron offensive avionic systems specialist, inspects a power control assembly battery for the central integrated test systems in a B-1 bomber during routine maintenance at Ellsworth Air Force Base, S.D., June 18, 2013. The system powers the B-1’s GPS, navigation, communication, sniper pod and radar capabilities.(U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)