Senior Airman Rory Valle checks the temperature of hardened lava at the Puna lava flow on the Big Island of Hawaii, Oct. 30, 2014. Upwards of the flow, temperatures beneath the dried top layer still exceed 600 degrees Fahrenheit. Valle is assigned to Hawaii Air National Guard's 291st Combat Communications Squadron. U.S. Army National Guard photo by Staff Sgt. Katie Gray

Senior Airman Daniel Wichers signals a B-52H Stratofortress with a light gun during Global Thunder 15 on Minot Air Force Base, N.D.,Oct. 26, 2014. Wichers is an air traffic controller assigned to the 5th Operations Support Squadron. U.S. Air Force photo by Senior Airman Stephanie Morris

A soldier drives a new light-tactical, all-terrain vehicle on Fort Bragg, N.C., Oct. 29, 2014. The soldier is a paratrooper assigned to the 82nd Airborne Division's 1st Battalion, 325th Airborne Infantry Regiment, 2nd Brigade Combat Team. U.S. Army photo by Staff Sgt. Jason Hull

Marine veteran Lance Cpl. Erik Galvin leaps from an obstacle during a Tough Mudder competition in Temecula, Calif., Oct. 25. The event, which occurs at various locations around the United States, is a military-style obstacle course focusing on endurance and teamwork. U.S. Army photo by Sgt. Felix R. Fimbres

Army Pvt. Ronnie Gallegos, right, and Pfc. Judge Parker, left, use hand-held mine detectors to sweep a path up to the M1271 mine-clearing vehicle during the extraction and recovery portion of a weeklong team-oriented course held on Fort Leonard Wood, Mo., Oct. 30,2014. U.S. Army photo by Sgt. 1st Class Michel Sauret

An Air Force F-15E Strike Eagle conducts aerial training during exercise Southern Strike 15 near the Combat Readiness Training Center in Gulfport, Miss., Oct. 28, 2014. Southern Strike 15 is a total force, multiservice training exercise hosted by the Mississippi National Guard from Oct. 27 - Nov. 7. U.S. Air Force photo by Tech. Sgt. Barry Loo

U.S. Army Pfc. Devon Earle provides security with an M203 A1 grenade launcher during exercise Combined Resolve III at the Joint Multinational Readiness Center in Hohenfels, Germany, Oct. 29, 2014. U.S. Army photo by Sgt. Gemma Iglesias

Marines engage targets while participating in a pre-scout sniper course on Camp Pendleton Calif., Oct., 27, 2014. U.S. Marine Coprs photo by Cpl. Seth Starr