An F-22 Raptor from the 95th Fighter Squadron, 325th Fighter Wing, Tyndall Air Force Base, Fla., participates in a multi-aircraft flyover in Warsaw, Poland during the 100th Anniversary of Polish Independence and Armed Forces Day. (SA Joshua Magbanua/U.S. Air Force)
Tanks roll on one of the city's main streets during a yearly military parade celebrating the Polish Army Day in Warsaw, Poland, Wednesday, Aug. 15, 2018. Poland marks Army Day with a parade and a call for US permanent military base in Poland. (AP Photo/Alik Keplicz)
The Arleigh Burke-class guided-missile destroyer USS Carney (DDG 64) transits the Mediterranean Sea under the stars on evening of Aug. 11, 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)
In this photo taken on Thursday, Aug. 16, 2018, journalists film and photograph drones that allegedly attacked the Russian air base and were captured by the Russian military at the Hemeimeem air base in Syria. Russian air defense assets in Syria have downed 45 drones targeting their main base in the country, its military said Thursday, after an attack by the Islamic State group on a Syrian army base a day earlier killed seven troops. (AP Photo/Sergei Grits)
An Indian woman looks down the barrel of an 84-MM rocket launcher during an Indian Army exhibition at Panther Stadium in Amritsar on August 11, 2018. - School children are given a description of instruments and weapons used by the Army ahead of Independence Day celebrations. (NARINDER NANU/AFP/Getty Images)
A picture taken on August 8, 2018 during a trip in Yemen organized by the UAE's National Media Council (NMC) shows a Yemeni soldier loyal to the Saudi and UAE-backed government attending a mine clearance and dismantling training at a centre funded by the UAE armed forces, along the coast north of the southeastern port city of Mukalla, the capital Hadramawt province. (KARIM SAHIB/AFP/Getty Images)
Indian Navy personnel provide food and drinking water at a flooded area in the north part of Kochi, in the Indian state of Kerala, on August 18, 2018. - Rescuers in helicopters and boats fought through renewed torrential rain on August 18 to reach stranded villages in India's Kerala state as the toll from the worst monsoon floods in a century rose above 320 dead. (AFP/Getty Images)
Lt. Michelle Tanalega, an instructor at the Surface Warfare Officer School (SWOS), goes over the operation of a Conning Officer Virtual Environment (NSS COVE I) simulator with Naval Reserve Officers Training Corps (NROTC) Midshipman 1st Class James Olsen, a senior at the George Washington University from Portland, Oregon. (Scott A. Thornbloom/ U.S. Navy)
Russian military police officer, foreground, stand guard near the village of Tal Kroum, Syria, Tuesday, Aug. 14, 2018. The Russian military said Tuesday that its forces in Syria will help U.N. peacekeepers fully restore patrols along the frontier with the Israeli-occupied Golan Heights, reflecting Moscow's deepening role in mediating between the decades-old foes. (AP Photo/Sergei Grits)
Indian army soldiers explain the use of an 84-MM rocket launcher to visitors during an Indian Army exhibition at Panther Stadium in Amritsar on August 11, 2018. - School children are given a description of instruments and weapons used by the Army ahead of Independence Day celebrations . (NARINDER NANU/AFP/Getty Images)
Philippine Defense Secretary Delfin Lorenzana, left, and U.S. Ambassador to the Philippines Sung Kim inspect a Special Airborne Mission Installation and Response (SABIR) equipment that is mounted on a Philippine Air Force C-130 military cargo plane during a ceremonial acceptance and turnover ceremony Tuesday, Aug. 14, 2018 at Villamor Air Base in suburban Pasay city, east of Manila, Philippines. Military officials said the SABIR, equipped with a high resolution camera and a doppler radar, is capable in counterterrorism and humanitarian assistance and disaster relief operations. ( AP Photo/Bullit Marquez)
An Israeli Merkava battle tank is seen during a military exercise in the Israeli-annexed Golan Heights along the border with Syria on August 8, 2018. (JALAA MAREY/AFP/Getty Images)
US President Donald Trump (L) watches an air assault exercise with Army Major General Walter Piatt at Fort Drum, New York, on August 13, 2018. - Trump spoke at a signing ceremony for the John S. McCain National Defense Authorization Act for Fiscal Year 2019. (BRENDAN SMIALOWSKI/AFP/Getty Images)
In this Sunday, Aug. 12, 2018, photo, Afghan Security personnel petrol in the city of Ghazni province west of Kabul, Afghanistan. The United States has sent military advisers to aid Afghan forces in Ghazni, where they were struggling on Sunday to regain full control three days after the Taliban launched a massive assault on the eastern city. (AP Photo/Mohammad Anwar Danishyar)