He was 5 when he first fired an M-16, his father holding him to brace against the recoil. At 17 he enlisted in the Marine Corps, spurred by the memory of 9/11. Now, 21-year-old Galen Wilson has 20 confirmed kills in four months in Iraq and another 40 shots that probably killed insurgents. One afternoon the lance corporal downed a man hauling a grenade launcher five-and-a-half football fields away.
