The Department of Defense has identified 3,618 American service members who have died since the start of the Iraq war. It confirmed the deaths of the following Americans yesterday: BARNES, Nathan S., 23, Sgt., Army; American Fork, Utah; 10th Mountain Division. BOBB, Brandon K., 20, Pfc., Army; Orlando, Fla.; 89th Military Police Brigade JOSHUA, Ron J. Jr., 19, Pfc., Army; Austin, Tex.; 89th Military Police Brigade.