Al Asad Airbase in Iraq's western Anbar desert.AP Photo/Nasser Nasser In January 2020, Iran fired nearly a dozen ballistic missiles at an Iraqi base housing US troops. No US personnel were killed, but more than 100 were later diagnosed with traumatic brain injuries. Those injuries were a likely preview of US casualties in a future war, medical researchers say. An unprecedented Iranian ballistic-missile attack in Iraq in January 2020 offered a worrying glimpse of the less visible but long-lasting injuries US troops will likely sustain in future wars.Five days after the assassination of Iranian Gen.