Japan Ground Self-Defense Forces tanks and armoured vehicles advance during an annual live fire military exercise at the Higashi-Fuji firing range in Gotemba, at the foot of Mount Fuji in Shizuoka prefecture, on August 26, 2018. (JIJI PRESS/AFP/Getty Images)
Japan Ground Self-Defense Force battle tanks and vehicles fire smoke rounds during a live fire exercise at the foot of Mount Fuji in the Hataoka district of the East Fuji Maneuver Area on August 23, 2018 in Gotemba, Shizuoka, Japan. (Photo by Tomohiro Ohsumi/Getty Images)
Tanks ride along Khreshchatyk Street, during a military parade to celebrate Independence Day in Kiev, Ukraine, Friday, Aug. 24, 2018. (AP Photo/Efrem Lukatsky)
Ukrainian female soldiers gather along Khreshchatyk Street before the start of a military parade to celebrate Independence Day in Kiev, Ukraine, Friday, Aug. 24, 2018. (AP Photo/Felipe Dana)
The Arleigh Burke-class guided-missile destroyer USS Carney (DDG 64) transits the Black Sea, Aug. 22, 2018. Carney, forward-deployed to Rota, Spain, is on its fifth patrol in the U.S. 6th Fleet area of operations in support of regional allies and partners as well as U.S. national security interests in Europe and Africa. (MC1 Ryan U. Kledzik/Navy)
Marines with Lima Company, Battalion Landing Team 3/1, 13th Marine Expeditionary Unit (MEU), fast-rope out of an MV-22B Osprey, Marine Medium Tiltrotor Squadron 166 Reinforced, 13th MEU, during sustainment training exercise, July 21, 2018 in Hawaii. (Cpl. A. J. Van Fredenberg/Marine Corps)
A missing man formation flies over the Air Force Memorial on Aug. 24, 2018, during a Medal of Honor unveiling ceremony for Air Force combat controller Technical Sgt. John Chapman, who was posthumously awarded the Medal of Honor. (Alan Lessig/Staff)
US soldiers march during a military parade in Kiev on August 24, 2018, to celebrate the Independence Day, 27 years since Ukraine gained independence from the Soviet Union. - Around 4,500 servicemen, including dozens representatives of foreign allies like the United States and Great Britain, saluted Ukrainian President Petro Poroshenko during a military parade. (GENYA SAVILOV/AFP/Getty Images)
Smoke and dust rise following an air strike from an Afghan military helicopter during ongoing clashes between Afghan security forces and militants near the Eid Gah Mosque in Kabul on August 21, 2018. - Military helicopters were firing above a mosque in Kabul's old quarter Tuesday as officials said fighting had broken out between security forces and militants in the Afghan capital, with a barrage of rockets striking the city. (WAKIL KOHSAR/AFP/Getty Images)
Japan Ground Self-Defense Force Chinook transport helicopters fly during a live fire exercise at the foot of Mount Fuji in the Hataoka district of the East Fuji Maneuver Area on August 23, 2018 in Gotemba, Shizuoka, Japan. The three-day annual live-fire drill takes place as the Defense Ministry is expected to submit a record request of 5.3 trillion yen for the fiscal 2019 budget this month. (Photo by Tomohiro Ohsumi/Getty Images)
Guard Battalion soldiers with an anti-aircraft shoulder launched missile take part in the military parade during Soldier's Day, at the Army's headquarters in Brasilia, Brazil, Friday, Aug. 24, 2018. The Brazilian Army celebrates throughout Brazil the Day of the Soldier, honoring the soldiers killed in combat. (AP Photo/Eraldo Peres)
A Japan Ground Self-Defense Forces type-16 mobile combat vehicle fires during an annual live fire military exercise at the Higashi-Fuji firing range in Gotemba, at the foot of Mount Fuji in Shizuoka prefecture, on August 26, 2018. (JIJI PRESS/AFP/Getty Images)
Mobile missile launch systems roll on Kiev central street during a military parade on August 24, 2018 to celebrate the Independence Day, 27 years since Ukraine gained independence from the Soviet Union. (GENYA SAVILOV/AFP/Getty Images)
People watch as tanks ride along Khreshchatyk Street during a military parade to celebrate Independence Day in Kiev, Ukraine, Friday, Aug. 24, 2018. (AP Photo/Felipe Dana)
Men dressed in WWI uniforms pose for a photograph during a reconstruction of the WWI battle of Verdun, Saturday, Aug. 25, 2018 in Verdun, eastern France. Hundreds of volunteers from 18 countries gathered in the French town Verdun as part of a string of events to mark the centenary of the end of World War One. (AP Photo/Jean-Francois Badias)