1970 in the Vietnam War The final military units from the Philippines , 1st Philippines Civic Action Force , leave South Vietnam . Operation Texas Star was a military operation of the Vietnam War in the A Shau Valley and the mountains east of the valley . It aimed at regaining the initiative in the area . The operation culminated in the Battle of Fire Support Base Ripcord . The Cambodian Campaign ( also known as the Cambodian Incursion ) was a series of military operations conducted in eastern Cambodia by the United States ( U . S . ) and the Republic of Vietnam ( South Vietnam ) during the Vietnam War . A total of 13 major operations were conducted by the Army of the Republic of Vietnam ( ARVN ) by U . S . forces between 1 May and 30 June . The Battle of Kompong Speu was when the combined forces of the South Vietnamese and Cambodian Armies fought to recapture the provincial capital of Kompong Speu . The town was captured by Communist forces on June 13 but was retaken by allied forces on June 16 . The Battle of Prey Veng was part of the Army of the Republic of Viet Nam ' s campaign in Cambodia . It took place in Prey Veng on June 15 , 1970 , where ARVN and Cambodian troops battled the Vietnam People ' s Army and Vietcong forces . It ended with an allied victory . In response to North Vietnam ' s support of Soviet Union in the Sino - Soviet split China removes its final troops that where in place to support the Chinese anti - aircraft batteries . The Battle of Fire Support Base Ripcord was a 23 - day battle between the U . S . Army 101st Airborne Division and the North Vietnamese Army from July 1 , 1970 until July 23 , 1970 . It was the last major confrontation between United States ground forces and North Vietnam of the Vietnam War . Operation Chenla I was an operation involving the Cambodian armed forces launched the operation during late August 1970 with limited air support from the South Vietnamese army and air force . The operation was terminated in February 1971 , after the Cambodian High Command made a decision to withdraw some units from Tang Kauk to protect Phnom Penh after Pochentong airbase was attacked . The objective of the operation was to reconnect Skoun and Kompong Cham along Route 7 , which was repeatedly attacked by Communist forces . Operation Chenla II was a major military operation conducted by the Cambodia n military ( then known as FANK ) during the Cambodian Civil War . It began on August 20 and lasted until December 3 , 1971 . Operation Jefferson Glenn was the last major operation in which U . S . ground forces participated in Vietnam . Operation Tailwind was a covert incursion into southeastern Laos by a company - sized element of U . S . Army Special Forces and Montagnard commando ( Hatchet Force ) of the Military Assistance Command , Vietnam Studies and Observations Group ( MACV - SOG or SOG ) , conducted between 11 September and 13 September 1970 during the Vietnam War ( also known as the Second Indochina War ) . The purpose of the operation was to create a diversion for a Royal Lao Army offensive and to exert pressure on the occupation forces of the People ' s Army of Vietnam ( PAVN ) . Operation Ivory Coast was a failed rescue mission conducted in North Vietnam during the Vietnam War by United States Special Operations Forces and other elements of the U . S . Military .