An C-17 Globemaster III aircrew with the 3rd Airlift Squadron load cargo in support of Operation Faithful Patriot at Fort Knox, Kentucky, on Oct. 29. (U.S. Air Force photo by Airman 1st Class Zoe M. Wockenfuss)
Police tape and memorial flowers are seen on October 28, 2018 outside the Tree of Life Synagogue after a shooting there left 11 people dead in the Squirrel Hill neighborhood of Pittsburgh on October 27, 2018. BRENDAN SMIALOWSKI/AFP/Getty Images
U.S. President Donald Trump, center, walks with Secretary of Defense James Mattis, third from left, and National Security Advisor John Bolton, second from left, during the NATO summit in Brussels, on July 11. (Emmanuel Dunand/AFP/Getty Images)
This aerial photo taken on Jan. 2, 2017, shows a Chinese navy formation, including the aircraft carrier Liaoning (C), during military drills in the South China Sea. (STR/AFP/Getty Images)
A protester dressed as Saudi Arabian crown prince Mohammed bin Salman and another dressed as U.S. President Donald Trump demonstrate outside the White House in Washington on Oct. 19. (Win McNamee/Getty Images)
A protester dressed as Saudi Arabian crown prince Mohammed bin Salman and another dressed as U.S. President Donald Trump demonstrate outside the White House in Washington on Oct. 19. (Win McNamee/Getty Images)
U.S. President Donald Trump, Secretary of Defense James Mattis, and Vice President Mike Pence walk into the Pentagon for a meeting January 18, 2018 in Washington, DC. BRENDAN SMIALOWSKI/AFP/Getty Images
A Royal Australian Air Force airman walks on the wing of an F-35A Lightning II at Luke Air Force Base in Arizona on Aug. 6. (U.S. Air Force photo by Staff Sgt. Jensen Stidham)
Japanese soldiers storm a beach in the Philippines on the South China Sea in joint military exercises with U.S. and Filipino troops on Oct. 6. (Ted Aljibe/AFP/Getty Images)
U.S. Vice President Mike Pence addresses the Hudson Institute on the administration's policy toward China in Washington, D.C., on October 4, 2018. JIM WATSON/AFP/Getty Images
Air Force Secretary Heather Wilson testifies before the Senate Appropriations Committee Subcommittee on Defense in Washington on May 17. (Air Force Photo by Staff Sgt. Rusty Frank)