Hagel volunteered to be drafted into the United States Army during the Vietnam War, rejecting a draft board recommendation that he go to college instead. He served in the United States Army infantry in Vietnam from 1967 to 1968. As a sergeant (E-5), he served as an infantry squad leader in the 9th Infantry Division. Hagel served in the same infantry squad as his younger brother Tom, and they are thought to be the only American brothers to have done so during the Vietnam War. They also saved each other's lives on separate occasions. Hagel received the Vietnamese Cross of Gallantry, two Purple Hearts, the Army Commendation Medal, and the Combat Infantryman Badge.