The comments of the president, who avoided the Vietnam War draft thanks to a diagnosis of bone spurs, drew swift criticism from veterans groups. "Don't just be outraged by #PresidentMayhem's latest asinine comments," Paul Rieckhoff, the founder of Iraq and Afghanistan Veterans of America, wrote in a Twitter post that day. "Take action to help vets facing TBIs," meaning traumatic brain injuries. Traumatic brain injuries result from the powerful changes in atmospheric pressure that accompany an explosion like that from a missile warhead. The missiles were launched by Iran in retaliation for the killing of a top Iranian general, Qassim Suleimani, by an American drone strike in Baghdad on Jan. 3.