Army Staff Sgt. Uriah Gibson and a Canadian engineer show Ukrainian troops how to clear a room after breaching a door with explosives in Ukraine, Feb. 23, 2017. Army photo by Sgt. Anthony Jones
Sailors compete in a three-on-three tournament in the hangar bay of the USS Theodore Roosevelt in the Pacific Ocean, Feb. 19, 2017. Navy photo by Petty Officer 3rd Class Spencer Roberts
Air Force Academy cadets carry a log during a medical evacuation march at Camp Bullis, Texas, Feb. 16, 2017. Air Force photo by Airman 1st Class Daniel Snider
An E-2C Hawkeye flies over the aircraft carrier USS Carl Vinson in the South China Sea, Feb. 23, 2017. Navy photo by Petty Officer 3rd Class Matt Brown
Army Lt. Col. David Tucker, a surgeon, works with Ghanaian dental residents to remove a sinus tumor during an exercise in Accra, Ghana, Feb. 22, 2017. Army photo by Staff Sgt. Shejal Pulivarti
Marine Corps Pfc. Caleb Roberts participates in a live-fire field training exercise at Camp Pendleton, Calif., Feb. 23, 2017. Marine Corps photo by Lance Cpl. Brooke Woods
Airmen use instruments to detect hazardous materials during a chemical, biological and nuclear response exercise at Eglin Air Force Base, Fla., Feb. 22, 2017. Air Force photo by Samuel King Jr.