At least 66 American service members in Iraq and Syria have been injured in a barrage of recent attacks by Iran-backed militants, though only a handful of troops have so far received Purple Hearts, according to the services.

Five Purple Hearts have been awarded, three for the Army and two for the Marine Corps, while the other services have not doled out any, spokespersons for each branch said. No details on the specific injuries were released, though many of the wounds recently inflicted on troops are believed to be traumatic brain injuries.