Army Sgt. 1st Class Jeremy Stanton, left, instructs two students from Fort Hood Air Assault School as they prepare to rappel 85 feet out of a UH-60 Black Hawk helicopter on Fort Hood, Texas, Nov. 20, 2013. Stanton is an air assault instructor. U.S. Army photo by Sgt. Ken Scar

U.S. Navy Petty Officer 3rd class Sonya De Costa maintains situational awareness while helping guide a 40-ton hydraulic crane during an effort to replace a 6,000-pound transformer that powers portions of Kadena Air Base, Okinawa, Japan, Nov. 21, 2013. De Costa is an equipment operator assigned to Naval Mobile Construction Battalion 3. U.S. Navy photo by Petty Officer 1st Class Chris Fahey

Army Master Sgt. Raymond Geoghegan gives the 10-minute warning to paratroopers as they approach Luzon Drop Zone and prepare to conduct airborne training on Fort Bragg, N.C., Nov. 21, 2013. Geoghegan is a jumpmaster assigned to the 82nd Airborne Division's 782nd Brigade, Support Battalion. U.S. Army photo by Sgt. 1st Class Joseph Armas

U.S. Army Lt. Gen. James L. Terry, commanding general of U.S. Army Central Command, cuts a cake for soldiers during Thanksgiving Day lunch on Camp Buehring in Kuwait, Nov. 28, 2013. The soldiers, assigned to the 36th Combat Aviation Brigade, are deployed to the Middle East to support Operation Enduring Freedom. U.S. Army photo by Sgt. Mark Scovell

U.S. Marine Corps Assistant Commandant Gen. John M. Paxton, center, serves Thanksgiving Day meals to Marines on Forward Operating Sabit Qadam in Afghanistan's Helmand province, Nov. 28, 2013. Paxton and other Headquarters Marine Corps staff visited Marines throughout Regional Command Southwest to wish them a happy Thanksgiving. The Marines are assigned to the 3rd Battalion, 7th Marine Regiment. U.S. Marine Corps photo by Sgt. Tammy K. Hineline

U.S. Deputy Defense Secretary Ash Carter walks with U.S. Army Lt. Col. Roy W. Speaks at the retrograde facility on Kandahar Airfield, Afghanistan, Nov. 29, 2013. Carter visited with troops who are moving military equipment out of Afghanistan during the drawdown. Speaks commands the Army Field Support Battalion Kandahar, 401st Army Field Support Brigade. DOD photo by Erin A. Kirk-Cuomo

Stephanie Carter, wife of U.S. Deputy Defense Secretary Ash Carter, visits with U.S. female troops in Afghanistan, Nov. 29, 2013. Carter thanked the troops for their dedication, hard work and service during the holiday season, and discussed issues that arise for deployed females on forward bases. DOD photo by Erin A. Kirk-Cuomo

U.S. Deputy Defense Secretary Ash Carter speaks with U.S. troops on Camp Leatherneck, Afghanistan, Nov. 29, 2013. Carter thanked the troops for their service during the holiday season, and for their dedication and hard work. DOD photo by Erin A. Kirk-Cuomo