Tech. Sgt. Eric Dagin pulls himself across a rope obstacle on March 3, 2015, at the Hillsborough County Sheriff?s Office firearms training center in Lithia, Fla. (Brandon Shapiro/U.S. Air Force)

Capt. Jeffrey Hansen, with tactical air control, establishes a perimeter and firing team during an exercise at Fort Drum, N.Y., on March 14, 2015. (Eric Miller/New York Air National Guard)

Airman 1st Class DeAaron Alexander receives a level-one contamination of oleoresin capsicum from Senior Airman Daniel Miller on Feb. 27, 2015, on Laughlin Air Force Base, Texas. After being hit with the pepper spray, the individual must then open their eyes, complete the five assessment stations and make it to the decontamination point on their own. (Steven R. Doty/U.S. Air Force)

An Alaska Air National Guard HH-60 Pave Hawk from the 210th Rescue Squadron conducts a 2013 training flight near Joint Base Elmendorf-Richardson, Alaska. (Bernie Kale/U.S. Air National Guard)

U.S. Army Sgt. 1st Class Matthew Girad is carried by U.S. Air Force Master Sgt. Eric Moss, while U.S. Marine Sgt. Trevor Andrews provides cover during small unit tactics training at Fort Bliss, Texas, on March 14, 2015, as part of Operational Contract Support Joint Exercise 2015. (Veronica Montes/U.S. Air Force)

Nathan Cumminskey, an employee of the Guardian Center of Georgia, fires blank rounds at students during a training event at Global Dragon Deployment For Training on on March 13, 2015. (Christopher Muncy/U.S. Air Force)

An A-10C Thunderbolt II sits on the flight line as an F-15E Strike Eagle flies over at RAF Lakenheath, England, on March 13, 2015. The A-10s and airmen are deployed out of Davis-Monthan Air Force Base, Ariz., as part of Operation Atlantic Resolve. (Trevor T. McBride/U.S. Air Force)