Tech. Sgt. Andrew Carr, 434th Air Refueling Wing historian, reaches for Basic Aerospace Doctrine of the Air Force, volume II, at Grissom Air Reserve Base, Indiana, April 9, 2016. Air Force historians are responsible for creating yearly periodic analytical documents for the Air Force Reserve Command Historian at Robbins Air Force Base, Georgia. (U.S. Air Force photo/Staff Sgt. Katrina Heikkinen)
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