Danny Lee Jacks of Rison, Arkansas served in the army from 1967 to 1970, achieving the rank of Staff Sergeant. He attended Airborne School and the Light Weapons Course at Fort Benning, Georgia, and was assigned to Company G, Rangers, 75th Infantry Regiment, with the 23rd Infantry Division in Vietnam. He conducted long-range reconnaissance patrols in 1969 and 1970.

Jacks earned numerous awards, including the Silver Star Medal for gallantry, two Bronze Stars for valor, the Purple Heart, the Air Medal, and the Combat Infantryman's Badge. In 1970, he led an assault during an aerial reconnaissance mission, resulting in the destruction of a hostile force. His leadership and bravery inspired his unit as he marked enemy positions for airstrikes under intense fire.

In 2005, Staff Sergeant Jacks was inducted into the U.S. Army Ranger Hall of Fame at Fort Benning, GA, and remains connected with the Rangers of the 75th Regiment.