Lance Cpl. James Stack died in combat in Helmand Province of Afghanistan on Wednesday.
The 20-year-old Stack was from Arlington Heights, Ill. He was assigned to the 3rd Battalion, 5th Marine Regiment, which has lost 15 Marines in the past couple of months.
Since 2001, nearly 1,400 American lives have been lost in Afghanistan, with 2010 proving to be the deadliest year so far.