Vice President Mike Pence, from left, U.S. Army Maj. Gen. Michael Howard and acting Defense Secretary Patrick Shanahan participate in a wreath-laying

Vice President Mike Pence, from left, U.S. Army Maj. Gen. Michael Howard and acting Defense Secretary Patrick Shanahan participate in a wreath-laying ceremony at the Tomb of the Unknown Soldier in observance of Memorial Day, Monday, May 27, 2019, at Arlington National Cemetery in Arlington, Va. (AP Photo/Patrick Semansky)

Vice President Mike Pence, from left, U.S. Army Maj. Gen. Michael Howard and acting Defense Secretary Patrick Shanahan participate in a wreath-laying ceremony at the Tomb of the Unknown Soldier in observance of Memorial Day, Monday, May 27, 2019, at Arlington National Cemetery in Arlington, Va. (AP Photo/Patrick Semansky)