Master Sgt. Kristofer Reyes, a 99th Airlift Squadron flight engineer, inspects the wings of a C-37A at Joint Base Andrews, Md., June 7, 2016. Reyes is responsible for monitoring and maintaining the mechanical and electrical systems on the C-37A, which is a highly modified Gulfstream G5, and is used, along with the VC-25, C-20B, C-37B, C-32A and C-40B for executive airlift of the U.S. president, vice president, cabinet members, combatant commanders, and other senior military and elected leaders. (U.S. Air Force photo/Senior Master Sgt. Kevin Wallace)