GRISSOM AIR RESERVE BASE, Ind. -- Senior Airman Cory King, an aircraft electrical and environmental specialist with the 434th Aircraft Maintenance Squadron, explains how an auxiliary power unit works to a group of Navy Junior Reserve Officers Training Corps cadets onboard a KC-135R Stratotanker here Sept. 8. The cadets visited the base to gain a better understanding of military operations and life. The group was from Proviso East High School in Maywood, Ill. An APU provides electrical power and is an air source for starting the engines during start-up procedures. (U.S. Air Force photo/Tech. Sgt. Mark R. W. Orders-Woempner)
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