A U.S. Air Force F-22 Raptor fighter jet touches down at Gwangju Air Base in South Korea on Dec. 2, 2017. (Senior Airman Colby L. Hardin/U.S. Air Force/Getty)
U.S. Defense Secretary Jim Mattis and Chinese Defense Minister Wei Fenghe inspect an honour guard during a welcome ceremony at the Bayi Building in Beijing on June 27, 2018. MARK SCHIEFELBEIN/AFP/Getty Images
U.S. marines load ordnance into an F-35B Lightning II aboard the Wasp-class amphibious assault ship USS Essex in preparation for the F-35B's first combat strike on Sept. 27. (Photo by Cpl. A. J. Van Fredenberg/U.S. Marine Corps via Getty Images)
U.S. Secretary of Defense James Mattis and National Security Advisor John Bolton attend the opening ceremony at the 2018 NATO Summit at NATO headquarters in Brussels on July 11. (Photo by Sean Gallup/Getty Images)
An MQ-9 Reaper drone is parked in an aircraft shelter at Creech Air Force Base on November 17, 2015, in Indian Springs, Nevada. (Photo by Isaac Brekken/Getty Images)
U.S. President Donald Trump waits to address the 72nd session of the United Nations General Assembly at the UN headquarters in New York on September 19, 2017. TIMOTHY A. CLARY/AFP/Getty Images
U.S. Air Force Maj. Charles Hodges (left) and airmen from the U.S. Indo-Pacific Command meet with Royal Thai military officials and a Thai engineering company to advise and assist in the rescue operation at the Tham Luang cave system on June 30. (U.S. Air Force photo by Capt. Jessica Tait)
Two U.S. Air Force B-52H Stratofortress bombers fly over the Pacific Ocean during a routine training mission on Aug. 2. (U.S. Air Force photo by Airman 1st Class Gerald R. Willis)
Smoke rises in the Syrian village of Kafr Ain in the southern countryside of Idlib province after an airstrike on Sept. 7. (Anas al-Dyab/AFP/Getty Images)
Sen. Tim Kaine (D-Va.) listens to testimony during a Senate Foreign Relations Committee hearing on Dec. 6, 2017, in Washington, D.C. (Drew Angerer/Getty Images)
This picture shows the destruction after government forces bombed the town of Al Habit on the southern edges of the rebel-held Idlib province on September 9, 2018. OMAR HAJ KADOUR/AFP/Getty Images
A French soldier involved in the regional anti-insurgent Operation Barkhane stands guard next to a Reaper drone at the French military air base in Niamey, Niger, on March 14, 2016. (Pascal Guyot/AFP/Getty Images)
U.S. Secretary of State Mike Pompeo looks on as U.S. Secretary of Defense James Mattis speaks during a press conference at the Australia-U.S. Ministerial Consultations at the Hoover Institution on the campus of Stanford University on July 24, 2018 in Stanford, California. Justin Sullivan/Getty Images
