A future wide receiver lines up to snag a pass during a National Football League ProCamp, on Thursday, July 16, 2015, at Seymour Johnson Air Force Base, N.C. ProCamps are held all over the U.S., and internationally, to give children a chance to train with professional athletes. (Ashley J. Thum/U.S. Air Force)

APEX students offload a pallet of household goods on Tuesday, July 7, 2015 onto a 60K tunner at Travis Air Force Base, Calif. Students were required to complete a minimum of 36 hours of hands-on training as part of the APEX training course. (Amber Carter/U.S. Air Force)

A special tactics special operation weatherman from the 320th Special Tactics Squadron carries his parachute and gear after performing a HALO jump during exercise Talisman Sabre in Northern Territory, Australia, on Friday, July 10, 2015. Stephen G. Eigel/U.S. Air Force (Stephen G. Eigel/U.S. Air Force)

A C-130 Hercules takes off during a training exercise at Yokota Air Base, Japan, on Tuesday, July 14, 2015. Ten C-130s participated in the exercise which tested the 36th Airlift Squadron?s ability to perform large formation flights. (David Owsianka/U.S. Air Force)

A 91st Security Forces Group member guards the fence line of a launch facility during an exercise near Donnybrook, N.D., on Monday, June 29, 2015. Airmen from 219th Security Forces Squadron and 791st Missile Security Forces Squadron worked together to pacify personnel dressed as simulated aggressors and recapture a launch facility. (Sahara L. Fales/U.S. Air Force)

Airmen from the 8th Security Forces Squadron conduct perimeter security following a simulated ground attack during Exercise Beverly Midnight 15-4 at Kunsan Air Base, Republic of Korea, on Thursday, July 16, 2015. Airmen reacted, survived and operated in a simulated combat zone. (Katrina Heikkinen/U.S. Air Force)

Spouses of military members at the 180th Fighter Wing were given the opportunity to take a ride on a KC-135 Stratotanker and watch F-16 Fighting Falcons being refueled in mid-air on Sunday, July 12, 2015, in Swanton, Ohio. ()