Airman 1st Class Luke Locken, 4th Operations Support Squadron aircrew flight equipment technician, adjusts night vision goggles on Jeremiah Seaberry during a 4th Fighter Wing Pilot for a Day event on Friday, April 3, 2015, at Seymour Johnson Air Force Base, N.C. (Ashley J. Thum/U.S. Air Force)

A combat controller assigned to the 22nd Special Tactics Squadron at Joint Base Lewis-McChord, Wash., practices free fall techniques in the iFly wind tunnel in Seattle on Wednesday, March 25, 2015. (Todd Wivell/U.S. Air Force)

An HH-60G Pave Hawk assigned to the 33rd Rescue Squadron drops off two pararescuemen during the Forceful Tiger exercise over the Pacific Ocean on Wednesday, April 1, 2015. (Rachelle Coleman/U.S. Air Force)

An F-15C Eagle from Kadena Air Base, Japan, receives fuel from a KC-135 Stratotanker during the Forceful Tiger exercise over the Pacific Ocean on Wednesday, April 1, 2015. (Zade C. Vadnais/U.S. Air Force)

U.S. soldiers from the 10th Special Forces Group load simulated casualties onto a CV-22 Osprey April 2, 2015, at Melrose Air Force Range, N.M. (Shelby Kay-Fant/U.S. Air Force)

Airmen from the 621st Contingency Response Wing run away from a U.S. Army UH-60 Black Hawk helicopter assigned to the 1-150th Assault Helicopter Battalion after hooking up cargo, as another Black Hawk waits for its turn during sling-load training at Joint Base McGuire-Dix-Lakehurst, N.J., on Wednesday, April 1, 2015. (Gustavo Gonzalez/U.S. Air Force)