Members of the first group of 10 Democratic presidential candidates take the stage for the first debate of the 2020 campaign in Miami-Dade County, Florida, on June 26.
U.S. Army Secretary Mark Esper announces that Austin, Texas, will be the new headquarters for the Army Futures Command during a news conference at the Pentagon July 13, 2018 in Arlington, Virginia. (Photo by Chip Somodevilla/Getty Images)
Acting U.S. Secretary of Defense Patrick Shanahan speaks during his meeting with his Portuguese counterpart, João Gomes Cravinho, at the Pentagon in Washington on June 14.
US President Donald Trump, First Lady Melania Trump, Poland's President Andrzej Duda and his wife Agata Kornhauser-Duda watch as an F-35 fighter planes flies over the White House on June 12, 2019, in Washington DC. (Photo by MANDEL NGAN / AFP) (Photo credit should read MANDEL NGAN/AFP/Getty Images)
A picture taken on May 13, 2019, shows the crude oil tanker, Amjad, which was one of two Saudi tankers that were damaged in mysterious attacks off the coast of the Gulf emirate of Fujairah.
An Iranian military truck carries surface-to-air missiles past a portrait of Iran's Supreme Leader Ayatollah Ali Khamenei during a parade on the occasion of the country's annual army day on April 18, 2018, in Tehran.
British newspapers show U.S. Republican candidate and President-elect Donald Trump on their front pages the day after he was announced the winner in U.S. presidential elections on Nov. 9, 2016.
MH-60S Sea Hawk helicopters assigned to the "Dusty Dogs" of Helicopter Sea Combat Squadron 7, attached to Carrier Strike Group 12 and the Nimitz-class aircraft carrier USS Abraham Lincoln, are recalled to Naval Station Norfolk on September 15, 2018. (Jeff Sherman/U.S. Navy via Getty Images)