A picture taken on January 13, 2020 during a press tour organized by the U.S.-led coalition fighting the remnants of the Islamic State group, shows a view of the damage at Ain al-Asad military airbase housing U.S. and other foreign troops in the western Iraqi province of Anbar.

A total of 50 U.S. service members suffered traumatic brain injury from this month's Iranian missile attack on Iraqi bases hosting American troops, the Pentagon said Tuesday.

Of those TBI cases, which can include concussions, 31 were treated in Iraq and have returned to duty, Pentagon spokesman Lt. Col. Thomas Campbell said in a statement.