Sweden's Stridsvagn 122 main battle tank in the snow

M1 Abrams tank crushes a car during a simulated battle at Bemowo Piskie Training Area, Poland, July 13, 2019.

U.S. and Polish troops participate in a simulated tank battle at Bemowo Piskie Training Area, Poland, July 13, 2019.

M1 Abrams tanks maneuver into position at Novo Selo Training Area, Bulgaria, July 12, 2019, during Platinum Lion

Navy and Coast Guard ships sail in formation with Australian, Canadian and Japanese ships in the Coral Sea, July 11, 2019, during Talisman Sabre, an exercise highlighting the U.S.-Australian alliance.

USS Ronald Reagan and the USS Wasp sail in formation with other U.S. Navy, U.S. Coast Guard, Australian, Canadian and Japanese ships in the Coral Sea, July 11, 2019, during Talisman Sabre.

US Air Force AC-130J Ghostrider taxis the runway at Eglin Air Force Base, Florida (January 31, 2017)