Marines assigned to Marine Corps Forces Special Operations Command jump out of a KC-130J Hercules during air-delivery training at Camp Pendleton, Calif., Dec. 7, 2017. Marine Corps photo by Cpl. Carlos Jimenez
Navy Petty Officer 2nd Class Chris Carlson performs underwater cutting operations while working with divers assigned to Underwater Construction Team 2 in Apra Harbor, Guam, Dec. 11, 2017. Navy photo by Petty Officer 1st Class Arthurgwain Marquez
Paratroopers jump from an Air Force C-130 Hercules aircraft at Juliet drop zone during training in Pordenone, Italy Dec. 12, 2017. The paratroopers serve in part on the Army's Contingency Response Force in Europe. Army photo by Paolo Bovo
Navy Petty Officer 1st Class Antonio Rodriguez directs an F-35C Lightning II during flight operations aboard the aircraft carrier USS Abraham Lincoln in the Atlantic Ocean, Dec. 8, 2017. Navy photo by Petty Officer 1st Class Josue Escobosa
Air Force 23rd Wing leaders climb a radio antenna tower with fellow airmen at Moody Air Force Base, Ga., Dec. 11, 2017, during a tour of the base’s radar, airfield and weather systems facility. Air Force photo by Airman 1st Class Erick Requadt
Air Force Maj. Sasha B. Heath, a KC-10 Extender pilot, reviews course adjustments while returning from Joint Base Pearl Harbor-Hickam, Hawaii, to Joint Base McGuire-Dix-Lakehurst, N.J., Dec. 9, 2017. Air Force photo by Master Sgt. Mark C. Olsen
Navy Lt. Junsub Um participates in a Family Readiness Group bowling event in Yokosuka, Japan, Dec. 10, 2017. Um is a chaplain assigned to the U.S. 7th Fleet flagship USS Blue Ridge. Navy photo by Petty Officer 3rd Class Dylan McKay