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In the Vietnam War, the Mobile Riverine Force (MRF) (after May 1967), initially designated Mekong Delta Mobile Afloat Force, and later the Riverines, were a joint US Army and US Navy force that comprised a substantial part of the brown-water navy. The 9th Infantry Division's area of operations was in the rivers and canals of the Mekong Delta from 1967 to 1972. Operating deep within the Viet Cong (VC)–controlled Delta, the Division was charged with protecting the area and its population against VC insurgents and ensuring the success of the South Vietnamese government's pacification program.

The 9th Division was reactivated on 1 February 1966, and arrived in South Vietnam on 16 December 1966 from Fort Riley, Kansas. On deployment the division was assigned to the III Corps Tactical Zone of Vietnam where it commenced operations in Dinh Tuong and Long An Provinces (6 January-31 May 1967) in Operation Palm Beach. Its area of operations was in the rivers and canals of the Mekong Delta from 1967 to 1972. Operating deep within the Viet Cong (VC)–controlled Delta, the Division was charged with protecting the area and its population against VC insurgents and ensuring the success of the South Vietnamese government's pacification program. Faced with unrelenting physical hardships, a tenacious enemy and the region's rugged terrain.

5th Battalion, 60th Infantry (Mechanized Dec. 1966 – 12 September 1968; Infantry 13 September 1968 – October 1970) Activated at Fort Riley, Kansas, and assigned to the 9th Infantry Division for its deployment to the Republic of Vietnam in December 1966. The 9th Division was the only major U.S. combat unit to conduct operations in the Mekong Delta. On 13 September 1968, the 5th/60th Mech was "swapped" with the 1st/16th of the 1st Infantry Division. From then until August 1970, the 5th/60th operated as a "straight leg" infantry unit.

From September through November 1966 the soldiers of "Tropic Lightning" participated in Operation Attleboro, East of Tay Ninh City, in War Zone C. In 1967, the 25th and 4th Divisions, both located in the Pleiku area swapped and interchanged men, equipment and commands of a number of units. By the end of 1970 a large portion of Tropic Lightning soldiers had returned stateside to their base at Schofield Barracks, Hawaii. Infantry: 1st Battalion, (Mechanized) 5th Infantry Company F (LRP), 50th Infantry Company F (Ranger), 75th Infantry 38th Infantry Platoon (Scout Dog) 40th Infantry Platoon (Scout Dog) 44th Infantry Platoon (Scout Dog) 46th Infantry Platoon (Scout Dog) 66th Infantry Platoon (Combat Tracker)

The Cambodian campaign (also known as the Cambodian incursion and the Cambodian invasion) was a brief series of military operations conducted in eastern Cambodia in 1970 by South Vietnam and the United States as an extension of the Vietnam War and the Cambodian Civil War. Thirteen major operations were conducted by the Army of the Republic of Vietnam (ARVN) between 29 April and 22 July and by U.S. forces between 1 May and 30 June 1970.

The 9th Infantry Division ("Old Reliables") is an inactive infantry division of the United States Army. It was created as the 9th Division during World War I, but never deployed overseas. In later years, it would become an important unit of the U.S. Army during World War II and the Vietnam War. It was also activated as a peacetime readiness unit from 1947 to 1962 at Fort Dix, New Jersey, and Fort Carson, Colorado, and from 1972 to 1991 as an active-duty infantry division at Fort Lewis, Washington. Nicknamed the "Old Reliables", the division was eventually inactivated in December 1991

During the war the division's units often served with the Mobile Riverine Force and other US Navy units that made up the Brown Water Navy. Its area of operations was in the rivers and canals of the Mekong Delta from 1967 to 1972. Operation Speedy Express was one significant operation in which the division took part during the war and was one of 22 major combat engagements with North Vietnamese Army and Viet Cong main force units as well as thousands of small contacts during this period during division's presence in Vietnam. Operating deep within the Viet Cong–controlled Delta, the 9th Infantry Division of the U.S. Army was charged with protecting the area and its population against Communist insurgents and ensuring the success of the South