(Left) Maj. Scot Stewart, 22nd Operations Group aircraft commander, describes to Lt. Col. Eugene Croft, 22nd OG deputy commander, the upgrades that have been installed in the prototype KC-135 Stratotanker that they are in July 22, 2013, at McConnell Air Force Base, Kan. Some of the upgrades in block 45 include analog gauges that have been replaced with a digital monitor and a new auto-pilot system. (U.S. Air Force photo/Airman 1st Class Jose L. Leon)
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