On 16 January, over a week after the attack, several U.S. defense officials confirmed that "out of an abundance of caution", 11 U.S. troops were medically evacuated to military hospitals—three to Camp Arifjan in Ahmad al-Jaber Air Base, Kuwait and eight to Landstuhl Regional Medical Center in Landstuhl, Germany—to be treated for traumatic brain injury and to undergo further evaluations.