U.S. Air Force Senior Airman Daniel Phelps, 380th Expeditionary Aircraft Maintenance Squadron guidance and control technician, exchanges a fuel quantity indicator on an E-3 Sentry before a 970th Expeditionary Airborne Air Control Squadron training flight Oct. 24, 2012. Seven of the eight E-3 crews here come from Tinker Air Force Base, Okla., along with support personnel including aircraft maintainers. (U.S. Air Force photo/Tech. Sgt. Amanda Savannah/Released)