Air Force Chief of Staff Gen. Mark A. Welsh III, right, presents the Prisoner of War medal to Army Air Corps 1st Lt. James Mahon as Army Maj. Dwight Mears shakes Mahon's hand during a ceremony at the Pentagon, April 30, 2014. Mahon and seven other aviators, all bomber crew members shot down flying missions over Germany, were held in a prison camp in Wauwilermoos, Switzerland. The men originally were denied POW status. U.S. Air Force photo by Jim Varhegyi

U.S. Marine Corps Sgt. Sloan Seiler, foreground, patrols through a field during a mission outside Larr village in Afghanistan's Helmand province, April 25, 2014. Seiler, a section leader, is assigned to Weapons Company, 1st Battalion, 7th Marine Regiment. During the mission, Marines confiscated two rocket-propelled grenades hidden in a cache. U.S. Marine Corps photo by Cpl. Joseph Scanlan

A Mississippi Guardsman surveys damage on several streets in Tupelo, Miss., April 29, 2014. About 50 Mississippi Guardsmen responded to help, performing a variety of missions, including traffic control, patrolling and assisting local law enforcement officers. Mississippi National Guard photo by U.S. Army Staff Sgt. Jessica McCormick

Army Staff Sgt. Skipper J. Smith assists in the cleanup in Vilonia, Ark., April 29, 2014, after deadly tornados struck small communities in the central part of the state. Smith is assigned to Company E, 1st Battalion, 153rd Infantry Regiment, 39th Infantry Brigade. Guardsmen have responded to tornados in several states. Arkansas National Guard photo by Sarah Jones

U.S. President Barack Obama speaks to U.S. and Philippine service members at the Fort Bonifacio gymnasium in Manila, April 29, 2014. The president said he was in the Philippines during his fifth trip to Asia to "reaffirm our enduring alliance between our two countries." U.S. Marine Corps photograph by Staff Sgt. Jason W. Fudge

U.S. Marines await a CH-53E Super Stallion helicopter for a helicopter during a U.S.-France bilateral exercise in Djibouti, April 25, 2014. The Marines, assigned to Combat Logistics Battalion 22, 22nd Marine Expeditionary Unit, are deployed with the Bataan Amphibious Ready Group as a theater reserve and crisis response force throughout the U.S. Central Command and U.S. 5th Fleet areas of responsibility. U.S. Marine Corps photo by Sgt. Alisa J. Helin

Army Spc. Charlton Wilkinson, left, and Army Staff Sgt. Roy Roy Hudson help residents move a tree from their driveway in Tupelo, Miss., April 29, 2014. The soldiers are assigned to the Mississippi National Guards's 155th Armored Brigade Combat Team and 185th Theater Aviation Brigade. Mississippi National Guard photo by U.S. Army Staff Sgt. Jessica McCormick

U.S. Defense Secretary Chuck Hagel, right, hosts a meeting with Egyptian Foreign Affairs Minister Nabil Fahmy at the Pentagon, April 30, 2014. The two leaders met to discuss issues of mutual importance. DOD photo by U.S. Marine Corps Sgt. Aaron Hostutler