Munitions systems Airmen conduct a bomb build at Bagram Airfield, Afghanistan, Aug. 4, 2017. AMMO Airmen are responsible for the accountability of everything from small arms ammunitions to large-scale guided bomb units. (Staff Sgt. Benjamin Gonsier/Air Force)
A Navy MH-60S Seahawk displays the American flag while flying alongside the USS George H.W. Bush in the Atlantic Ocean, Aug. 10, 2017, during an air power demonstration rehearsal. (PO3 Matt Matlage/Navy)
Infantrymen from the 2nd Cavalry Regiment exit their Stryker Combat Vehicle for a dismounted patrol during a blank fire situational training exercise, Aug. 4, 2017, during Noble Partner 17 in Vaziani Training Area, Ga. (Staff Sgt. Jennifer Bunn/Army)
Marine Corps Cpl. Joshua B. Duarte, left, and a South Korean marine cross a rope bridge obstacle during Korean Marine Exchange Program 17-14 in South Korea, Aug. 9, 2017. (Cpl. Aaron S. Patterson/Marine Corps)
Air Force firefighters conduct fire pit training at Sparta/Fort McCoy Airport, Wis., Aug. 11, 2017, during Patriot Warrior, an Air Force Reserve exercise designed to enhance wartime skills. (Staff Sgt. Corban Lundborg/Air Force)
Marine Corps Sgt. John Guinta checks his equipment before performing a parachute jump from an CH-47 Chinook helicopter during Exercise Northern Strike 17 over Camp Grayling Joint Maneuver Training Center, Mich., Aug. 2, 2017. (Lance Cpl. Niles Lee/Marine Corps)
Army Pfcs. Deontrius Martin, right, and Matthew Joy provide security at Fort McCoy, Wis., Aug. 14, 2017, during an exercise involving more than 12,000 service members from the U.S. and six other nations. (Spc. John Russell/Army Reserve)
Information Systems Technician 3rd Class Brandin Heidrick, assigned to the cyclone-class patrol coastal ship USS Hurricane (PC-3), fires a MK38 MOD 2, 25mm machine gun Aug. 8, 2017. (MC2 Sean Furey/Navy)
An airman assigned to the 57th Rescue Squadron regroups with the rest of his team after a freefall jump during exercise Ares Shadow near Aviano, Italy, Aug. 9. (Airman 1st Class Eli Chevalier/Air Force)