Editing 31st Infantry Regiment (United States) (section)

==Vietnam War==
When the Army abandoned battle groups in favor of brigades and battalions in 1963, the 31st Infantry's 1st and 2nd Battalions were reactivated in South Korea, the 3rd Battalion remained in the Army Reserve, and the 5th Battalion replaced the 2nd Battle Group at Fort Rucker. When the [[Vietnam War]] came, two more battalions of the 31st Infantry were formed. The 4th Battalion was formed at [[Fort Devens]], Massachusetts in 1965 and the 6th Battalion was formed at [[Fort Lewis (Washington)|Fort Lewis]], Washington in 1967.

[[File:4th Bn 31st Infantry Rgmt Nui Cho Mountain, Vietnam.jpg|thumb|Soldiers from the 4th Battalion, 31st Infantry Regiment at Nui Cho Mountain.]]
The 4th Battalion went to [[South Vietnam]] in the spring of 1967, operating initially in [[War Zone D]] and around [[Tay Ninh]] near the [[Cambodia]]n border as a unit under the [[196th Infantry Brigade (United States)|196th Infantry Brigade (Separate)]]. In 1967, the battalion moved north to help form the [[23rd Infantry Division (United States)|23rd "Americal" Infantry Division]]. Operating at [[Quang Ngai]], [[Chu Lai]] and the [[Que Son Valley]] for most of the rest of the war, the 4th Battalion fought to keep [[Viet Cong]] guerillas and the [[People's Army of Vietnam]] away from the coastal lowlands. Two of the battalion's men earned the Medal of Honor almost a year apart near the bitterly contested village of [[Hiep Duc]]. When American forces departed, the 4th Battalion 31st Infantry was part of the last brigade to leave Vietnam. It was inactivated in 1971.

The 6th Battalion was sent to South Vietnam in the spring of 1968, arriving just in time to help [[Battle of South Saigon|recapture Saigon's suburbs]] during the abortive [[May Offensive]]. For the next two years, the 6th Battalion fought all across the [[Mekong Delta]] and the [[Đồng Tháp Mười|Plain of Reeds]]. When the [[9th Infantry Division (United States)|9th Infantry Division]] departed in 1969, the 6th Battalion 31st Infantry formed the nucleus of a 1,200-man task force under LTC [[Gerald Carlson]] (Task Force Carlson) to cover the division's departure. Remaining in Vietnam, the 6th Battalion conducted an Air Assault as part of the 3rd Brigade into the [[Parrot's Beak, Cambodia]] in May 1970, making the famed "Seminole Raid" to seize and destroy a huge enemy base area bordering the Plain of Reeds. The battalion returned to Fort Lewis for inactivation in October 1970.