A B-52H Stratofortress assigned to the 20th Expeditionary Bomb Squadron is seen through night vision coming in for a landing Thursday, May 9, 2019, at Al Udeid Air Base, Qatar. The B-52 bombers ordered by the White House to deploy to the Persian Gulf to counter unspecified threats from Iran are beginning to arrive at a major American air base in Qatar. (Staff Sgt. Ashley Gardner/U.S. Air Force via AP)