Members of the US Army's 1st Armored Battalion of the 9th Regiment, 1st Division from Fort Hood in Texas sit on a Abrams battle tank after arriving at the Pabrade railway station some 50 km (31 miles) north of the capital Vilnius, Lithuania, Monday, Oct. 21, 2019. The U.S. military says it's preparing a massive exercise early next year in Europe involving 20,000 soldiers from the U.S., the largest deployment across the Atlantic for training in more than 25 years. (AP Photo/Mindaugas Kulbis)
Syrian Kurds, one of them carrying a Kurdish YPG (People's Protection Units) flag, watch as a US military vehicle drives on a road after US forces pulled out of their base in the Northern Syrian town of Tal Tamr, on October 20, 2019. - US forces withdrew from a key base in northern Syria today, a monitor said, two days before the end of a US-brokered truce to stem a Turkish attack on Kurdish forces in the region. (DELIL SOULEIMAN/AFP via Getty Images)
An armoured personnel carrier transports Turkey-backed Syrian fighters on the road between the Syrian towns of Tal Abyad and Kobane on the Turkish border on October 16, 2019 as Turkey and its allies continue their assault on Kurdish-held border towns in northeastern Syria. - (Photo by BAKR ALKASEM/AFP via Getty Images)
Members of the US Army 1st Division 9th Regiment 1st Battalion unload heavy combat equipment including Abrams tanks and Bradley fighting vehicles at the railway station near the Pabrade military base in Lithuania, on October 21, 2019. - The United States on October 21, 2019 began deploying a battalion of troops and dozens of tanks to Lithuania for an unprecedented six-month rotation, a move sought by the Baltic EU and NATO state to deter neighboring Russia. Dozens of Abrams tanks and Bradley armored vehicles arrived by railway at the army training area in Pabrade. (PETRAS MALUKAS/AFP via Getty Images)
This photo taken on October 17, 2019 shows China's Bayi Aerobatic Team performing during the Chinese People's Liberation Army Air Force Aviation Open Day in Changchun in China's northeastern Jilin province, to mark the 70th anniversary of the founding of the Chinese People's Liberation Army Air Force. (Photo by STR/AFP via Getty Images)
This photograph taken on October 16, 2019 shows a US Navy F/A-18 Super Hornets multirole fighter landing on the flight deck of USS Ronald Reagan (CVN-76) aircraft carrier as it sails in South China Sea on its way to Singapore. (Photo by CATHERINE LAI/AFP via Getty Images)
A Turkish military tank drives in a field on the outskirts of Ceylanpinar on October 15, 2019 in Ceylanpinar, Turkey. The military action is part of a campaign to extend Turkish control of more of northern Syria, a large swath of which is currently held by Syrian Kurds, whom Turkey regards as a threat. U.S. President Donald Trump granted tacit American approval to this campaign, withdrawing his country's troops from several Syrian outposts near the Turkish border. (Photo by Burak Kara/Getty Images)
The U.S. Navy Flight Demonstration Squadron, the Blue Angels, fly in formation with the B-29 Superfortress "Doc" during the 2019 California Capital Air Show in Sacramento. (MC2 Timothy Schumaker/Navy)
Honduran soldiers take part in a parade commemorating Army Day in Tegucigalpa on October 19, 2019. (ORLANDO SIERRA/AFP via Getty Images)
An MH-60S Sea Hawk helicopter attached to the Nightdippers of Helicopter Sea Combat Squadron (HSC) 5 assigned to the aircraft carrier USS Abraham Lincoln (CVN 72) hoists search and rescue swimmers during a training exercise. The Abraham Lincoln Carrier Strike Group is deployed to the U.S. 5th Fleet area of operations in support of naval operations to ensure maritime stability and security in the Central Region, connecting the Mediterranean and the Pacific through the western Indian Ocean and three strategic choke points. (MC3 Jeremiah Bartelt/Navy)
Serbian Army soldiers perform during a military parade at the military airport Batajnica, near Belgrade, Serbia, Saturday, Oct. 19, 2019. Russian Prime Minister Dmitry Medvedev arrived on a one-day official visit to Serbia during which he attend military parade commemorating the 75th anniversary of the liberation of the Serbian capital from the Nazi German occupation by the Red Army and Communist Yugoslav Partisans. (AP Photo/Darko Vojinovic)
This picture taken on October 15, 2019 shows a missile fired by Turkish forces towards the Syrian town of Ras al-Ain, from the Turkish side of the border at Ceylanpinar district in Sanliurfa on the first week of Turkey's military operation against Kurdish forces. (OZAN KOSE/AFP via Getty Images)
This photo taken on October 17, 2019 shows people taking photos on a Z-8 multi-purpose helicopter during the Chinese People's Liberation Army Air Force Aviation Open Day in Changchun in China's northeastern Jilin province, to mark the 70th anniversary of the founding of the Chinese People's Liberation Army Air Force.(Photo by STR/AFP via Getty Images)
U.S. Marines attached to the Special Purpose Marine Air-Ground Task Force Crisis Response-Central Command (SPMAGTF-CR-CC) 19.2, load cargo into a KC-130J Super Hercules during a mission in Kuwait, Oct. 13, 2019. The SPMAGTF-CR-CC is designed to move with speed and precision to support operations throughout the Middle East. (Sgt. Kyle C. Talbot/Marine Corps)
Chilean army soldiers are pictured in a war tank during clashes against protesters in Santiago, on October 19, 2019. - Chile's president declared a state of emergency in Santiago Friday night and gave the military responsibility for security after a day of violent protests over an increase in the price of metro tickets. (MARTIN BERNETTI/AFP via Getty Images)