Trump had initially said he was told that no troops had been injured in the Jan. 8 missile strike on Iraq’s Ain al-Asad air base, which Iran carried out as retaliation for a U.S. drone strike in Baghdad that killed Iran’s most powerful general, Qassem Soleimani, on Jan. 3. The military said symptoms of concussion or traumatic brain injury were not immediately reported after the strike and in some cases became known days later. Many were in bunkers before nearly a dozen Iranian ballistic missiles exploded.