Soldiers fire an M777 towed 155 mm howitzer to support Iraqi security forces in northern Iraq, Aug. 15, 2017. (Cpl. Rachel Diehm/Army)Marine Corps KC-130J Hercules aircraft conduct division tactical navigation training with VMGR-152 as part of unit-level training Evergreen at Naval Air Station Whidbey Island, Wash., Aug. 18, 2017. (Cpl. Joseph Abrego/Marine Corps)A family waves at the the Nimitz-class aircraft carrier USS George H.W. Bush (CVN 77) as the ship arrives at Naval Station Mayport, Fla., Aug. 19, 2017. (MC2 Timothy Schumaker/Navy)An F-16 Fighting Falcon with the 555th Expeditionary Fighter Squadron - the Triple Nickel - takes off from Bagram Airfield, Afghanistan, Aug. 22, 2017. (Capt. Keenan Kunst/Air Force)