Air Force Master Sgt. Fred Pierce (second from left), a crew chief from the Missouri Air National Guard’s 139th Airlift Wing, teaches Airmen from the Connecticut, Kentucky, Montana and Missouri Air National Guard about the operation of a C-130’s Auxiliary Power Unit during a class at the Air National Guard’s Air Dominance Center in Savannah, Ga., June 15, 2016. The class is part of Maintenance University here, a weeklong course designed to provide intensive instruction in aircraft maintenance. Now in its eighth year, Maintenance University is sponsored by the 123rd Airlift Wing. ( Air

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Air Force Master Sgt. Fred Pierce (second from left), a crew chief from the Missouri Air National Guard’s 139th Airlift Wing, teaches Airmen from the Connecticut, Kentucky, Montana and Missouri Air National Guard about the operation of a C-130’s Auxiliary Power Unit during a class at the Air National Guard’s Air Dominance Center in Savannah, Ga., June 15, 2016. The class is part of Maintenance University here, a weeklong course designed to provide intensive instruction in aircraft maintenance. Now in its eighth year, Maintenance University is sponsored by the 123rd Airlift Wing. ( Air National Guard photo by Lt. Col. Dale Greer)

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Photo credit: © RP Photo / Alamy / Afripics
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