Joseph Biden speaks during a meeting with representatives from the video game and entertainment industries Jan. 11, 2013 at the Eisenhower Executive Office Building of the White House in Washington.
Lloyd Austin prepares to hold a media briefing on Operation Inherent Resolve, the international military effort against ISIS on Oct. 17, 2014 at the Pentagon in Washington.
U.S. soldiers wearing gas masks wait for orders during a chemical warfare exercise in Yeoncheon near the North Korea-South Korea border on Feb. 26, 2003.
Secretary of State Mike Pompeo and National Security Adviser John Bolton at the White House in Washington, DC, on Oct. 11, 2018. (Nicholas Kamm/AFP/Getty Images)
Defense Secretary James Mattis waits for the arrival of German Defense Minister Ursula von der Leyen outside the Pentagon June 20, 2018 in Arlington, Virginia. (Chip Somodevilla/Getty Images)