Military officials released few details about McDonald and have said little about the incident. The soldiers were in a clash with
"Investigators are looking into the likelihood that friendly fire was the cause" of the soldiers' deaths, a Pentagon spokesman, Rear Adm. John Kirby, said in a statement Tuesday. "Our thoughts and prayers are with the families of these fallen."
The U.S.-led coalition concurred: "The casualties occurred during a security operation when their unit came into contact with enemy forces. Tragically, there is the possibility that fratricide may have been involved," it said last week.
In addition to McDonald, also killed were Army Staff Sgt. Scott R. Studenmund, 24, of Pasadena; Cpl. Justin R. Clouse, 22, of
McDonald, along with Studenmund, was assigned to the 1st Battalion, 5th Special Forces Group, Ft. Campbell, Ky.
One Afghan soldier was also reported killed.