A U.S. Navy search and rescue swimmer jumps from a MH-60S Seahawk helicopter during a training evolution in the Arabian Gulf, Nov. 26, 2014. The Seahawk is assigned to Helicopter Sea Combat Squadron 26. U.S. Navy photo by Petty Officer 1st Class Patrick W. Mullen III

An MH-60S Seahawk helicopter recovers two search and rescue swimmers during training in the Arabian Gulf, Nov. 26, 2014. The Seahawk is part of Helicopter Sea Combat Squadron 26, Detachment 1. U.S. Navy photo by Petty Officer 1st Class Patrick W. Mullen III

U.S. Navy Seaman Nikolus Berry conducts maintenance on a circuit card aboard the aircraft carrier USS Carl Vinson in the U.S. 5th Fleet area of responsibility, Nov. 28, 2014. U.S. Navy photo by Petty Officer 2nd Class John Philip Wagner Jr.

Air Force Capt. Roy Poor III opens the canopy of an F-16C Fighting Falcon on Little Rock Air Force Base, Ark., Nov. 24, 2014. Poor is assigned to the 180th Fighter Wing. U.S. Air Force photo by Airman 1st Class Harry Brexel

U.S. Air Force Tech. Sgt. Christopher Genuardi performs breathing techniques during a gas mask fit test on Incirlik Air Base, Turkey, Nov. 21, 2014. The fit test is used to ensure the mask will work properly during emergency situations. Genuardi is assigned to the 39th Civil Engineer Squadron. U.S. Air Force photo by Airman Cory W. Bush

U.S. Marine Corps Lance Cpl. Jonathon E. Goff, right, helps pull Marines in his squad through an obstacle during the endurance course at the Jungle Warfare Training Center on Camp Gonsalves in Okinawa, Japan, Nov. 25, 2014. Goff is a rifleman assigned to the 1st Battalion, 1st Marine Regiment. U.S. Marine Corps photo by Cpl. Thor J. Larson

U.S. Marine Corps Cpl. Samuel C. Mills crosses a river obstacle while going through the Jungle Warfare Training Center’s endurance course on Camp Gonsalves in Okinawa, Japan, Nov. 25, 2014. Mills is a fire support man assigned to 1st Battalion, 1st Marine Regiment. U.S. Marine Corps photo by Cpl. Thor J. Larson

U.S. Marines go through the Jungle Warfare Training Center’s endurance course on Camp Gonsalves in Okinawa, Japan, Nov. 25, 2014. The Marines are assigned to 1st Battalion, 1st Marine Regiment. U.S. Marine Corps photo by Cpl. Thor J. Larson