Sgt. Alan J. Castillo was born November 13, 1984 and joined the Army in February 2008. Castillo was assigned to the 4th Battalion, 3d U.S. Infantry Regiment (The Old Guard), March 2009. After his second diagnosis of colon cancer, Castillo transitioned to the Fort Sam Houston, Texas, Warrior Transition Unit where he sought medical care. Unfortunately, Castillo loss his battle with cancer March 21, 2012. For those who knew Castillo, he will be remembered as a Soldier’s Soldier and someone who earnestly loved serving his country.