Planes over water

AIR FORCE PHOTOS

Major AWACS upgrade

The first E-3 Sentry, or Airborne Warning and Control System aircraft to receive the block 40/45 upgrade sits Nov. 18, 2010, outside the programmed depot maintenance hangar at Tinker Air Force Base, Okla., awaiting pre-checks prior to PDM and the installation of the upgrade. (Courtesy photo)

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