Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, talks with a member of the Minnesota Timberwolves basketball team as part of Commitment to Service, a partnership between the National Basketball Association and Defense Department, at the Pentagon, Dec. 17, 2014.
DoD photo by U.S. Navy Petty Officer 1st Class Daniel Hinton
U.S. Navy Petty Officer 1st Class Manuel Aguna directs an F/A-18C Hornet from the Strike Fighter Squadron 34 on the flight deck of the aircraft carrier USS John C. Stennis in the Pacific Ocean, Dec. 9, 2014. Aguna is an aviation boatswain's mate handling. The Stennis is undergoing an operational training period in preparation for future deployments.
U.S. Navy photo by Petty Officer 3rd Class Ignacio D. Perez
Air National Guard pilots fly an HH-60 Pave Hawk helicopter during a rescue training mission near Mount Susitna, Alaska, Dec. 16, 2014. The helicopter crew is assigned to the Alaska National Guard's 210th Rescue Squadron.
Alaska National Guard photo by U.S. Army Sgt. Balinda O'Neal
U.S. Deputy Defense Secretary Bob Work, left, greets Adm. Katsutoshi Kawano, right, chief of the Japanese Self-Defense Forces, as he arrives at the Pentagon in Washington D.C., to discuss matters of mutual importance, Dec. 18, 2014.
DoD photo by Air Force Master Sgt. Adrian Cadiz
Philip Dunne, Britain's Minister for defense equipment, support and technology signs the guest book at the Pentagon, Dec. 17, 2014.
DoD photo by U.S. Air Force Master Sgt. Adrian Cadiz
Air National Guard Senior Airman Christopher Bird pulls the intake cover off of an F-16C Fighting Falcon aircraft before a training mission on Atlantic City Air National Guard Base, N.J., Dec. 17, 2014. Bird is a crew chief assigned to the New Jersey Air National Guard's 177th Aircraft Maintenance Squadron.
New Jersey National Guard photo by U.S. Air Force Tech. Sgt. Matt Hecht
U.S. Army Master Sgt. Stephen Nelson measures wind speeds before airmen, soldiers, NATO partners and Santa parachuting during a toy drop operation at Alzey drop zone, Germany, Dec. 15, 2014. Nelson is an air traffic controller assigned to Detachment 1, 435th Contingency Response Group. Nelson and several other soldiers, airmen and NATO partners prepared the drop zone.
U.S. Air Force photo by Senior Airman Armando A. Schwier-Morales
U.S. Marines conduct a live-fire exercise during sustainment training in D'Arta Plage, Djibouti, Dec. 9, 2014. The Marines are assigned to Golf Company, Battalion Landing Team, 2nd Battalion, 1st Marines, 11th Marine Expeditionary Unit.
U.S. Marine Corps photo by Cpl. Laura Y. Raga