The Department of Defense announced today that Staff Sgt. Mark A. Lawton, 41, of Hayden, Colo., was killed on Aug. 29, 2003, north of As Suaydat, Iraq. Lawton was in a convoy that was hit by a rocket-propelled grenade.

Lawton was assigned to the 244th Engineer Battalion, U.S. Army Reserve, Grand Junction, Colo.

The incident is under investigation.