A former NFL player who joined the Marines and was motivated by college roommate Pat Tillman, who died in Afghanistan, was heading for the war himself Tuesday night. Lance Cpl. Jeremy Staat, a former defensive lineman for the Steelers and Rams who had been playing Arena Football, was one of 300 Marines in the 1st Battalion, 3rd Marine Regiment being deployed from Kaneohe Bay. The unit is expected to be in Iraq for seven months.