A piper plays as the second of the new Royal Navy aircraft carrier HMS Prince of Wales departs from Rosyth dockyard on September 19, 2019 in Rosyth, Scotland. The vessel will sit at anchor in the River Forth for around 3-5 days following departure from the dockyard to complete a period of consolidation training before putting to sea for trials. (Photo by Jeff J Mitchell/Getty Images)
The second of the new Royal Navy aircraft carrier HMS Prince of Wales departs from Rosyth dockyard on September 19, 2019 in Rosyth, Scotland. The vessel will sit at anchor in the River Forth for around 3-5 days following departure from the dockyard to complete a period of consolidation training before putting to sea for trials. (Photo by Jeff J Mitchell/Getty Images)
Russian army sappers move the troops through the river on pontoons during strategic command and staff exercises Center-2019 at Yurginskiy shooting range near Novosibirsk, Russia, Thursday, Sept. 19, 2019. (AP Photo/Sergei Grits)
Indian Defence Minister Rajnath Singh (2L) holds the hands of his pilot Air Vice Marshal N Tiwari (2R) after flying a sortie in a Tejas Light Combat Aircraft (LCA) at HAL Airport in Bangalore on September 19, 2019. (MANJUNATH KIRAN/AFP/Getty Images)
A helicopter prepares to land on the Philippine navy's strategic sealift vessel BRP Davao del Sur during an amphibious landing exercise at the lighthouse beach facing south China sea in Subic Freeport in Subic town, north of Manila on September 21, 2019, as part of a combined exercise between army, navy, air force and marines. (TED ALJIBE/AFP/Getty Images)
British Prime Minister Boris Johnson (not pictured) flies a Black Hornet nano drone during a meeting with military personnel on Salisbury plain training area on September 19, 2019 in Salisbury, England. (Photo by Ben Stansall - WPA Pool/Getty Images)
A Chinese military vehicle with what appears to be a drone under wraps, passes along a street in Beijing, Saturday, Sept. 21, 2019. Many of the streets in the central part of China's capital were shut down this weekend for a rehearsal for what is expected to be a large military parade on Oct. 1 to commemorate the 70th anniversary of Communist China. (AP Photo/Mark Schiefelbein)
A child poses for a photo on the engine of a KC-135 Stratotanker during an 'air power' open day event at the US air force base in Osan, south of Seoul on September 21, 2019. - The event was part of an annual ceremony to open the US airbase to the public for promoting friendship with its surrounding communities. (ED JONES/AFP/Getty Images)
US soldiers look at a performance of the Black Eagles, the aerobatic team of T-50 jets belonging to South Korea's air force, during "Air Power Day" preview at US Osan Air Base in Pyeongtaek on September 20, 2019. (JUNG YEON-JE/AFP/Getty Images)
Philippine marines take their position next to newly-acquired Amphibious Assault Vehicles (AAV) during an amphibious landing exercise in Subic Freeport in Subic town, north of Manila on September 21, 2019, as part of the combined exercise between army, navy, Air Force and Marines. (TED ALJIBE/AFP/Getty Images)
The Qinzhou, a Type 056 corvette-class ship deployed by China's People's Liberation Army (PLA) and attached to the Hong Kong Garrison, crosses Victoria Harbor in Hong Kong on September 24, 2019. - A garrison of thousands of PLA troops has long been stationed in Hong Kong since the handover from British to Chinese rule in 1997. (Photo by Nicolas ASFOURI / AFP)
Chinese military planes trail colored smoke as they fly in formation above the city center in Beijing, Sunday, Sept. 22, 2019. Many of the streets in the central part of China's capital were shut down this weekend for a rehearsal for what is expected to be a large military parade on Oct. 1 to commemorate the 70th anniversary of Communist China. (AP Photo/Andy Wong)
Military helicopters fly over the training ground during strategic command and staff exercises Center-2019 at Donguz shooting range near Orenburg, Russia, Friday, Sept. 20, 2019. (AP Photo/Sergei Grits)
A Russian Sukhoi Su-35 fighter takes off during an air show at the Teknofest festival at Ataturk Airport in Istanbul on September 17, 2019. - Ankara is looking to alternatives after it was removed by the US from the F-35 fighter jet program in response to its purchase of S-400 missile systems delivered by Moscow. (YASIN AKGUL/AFP/Getty Images)
Soldiers abseil from a military helicopter over the training ground during strategic command and staff exercises Center-2019 at Donguz shooting range near Orenburg, Russia, Friday, Sept. 20, 2019. The main theme of the drills is the use of a coalition army group in the fight against international terrorism and providing military security in Central Asia. Servicemen from Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, India, China and Pakistan are taking part in the drills, TASS News Agency reported. (AP Photo/Sergei Grits)
Russian army tank fires during strategic command and staff exercises Center-2019 at Yurginskiy shooting range near Novosibirsk, Russia, Thursday, Sept. 19, 2019. Servicemen from Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, India, China and Pakistan are taking part in the drills, TASS News Agency reported. (AP Photo/Sergei Grits)
A Syrian soldier tosses a training grenade at a tank during military exercises led by Russian military advisers at a military base about 50-kilometers away from Damascus, Syria, Tuesday, Sept. 24, 2019. (AP Photo/Alexander Zemlianichenko)
Turkish and US military vehicles take part in joint patrol in the Syrian village of al-Hashisha on the outskirts of Tal Abyad town along the border with Turkey, on September 24, 2019. - The United States and Turkey began joint patrols in northeastern Syria aimed at easing tensions between Ankara and US-backed Kurdish forces. (DELIL SOULEIMAN/AFP/Getty Images)