Vietnamization was a policy enacted in early 1969 by the Richard Nixon administration aimed at ending U.S. involvement in the Vietnam War by expanding, equipping, and training the South Vietnamese armed forces (ARVN) and increasing their combat role, while at the same reducing involvement of U.S. combat troops. The policy of Vietnamization, despite its successful execution, was ultimately a failure as the improved ARVN forces were unable to stop North Vietnam and its People's Army of Vietnam (PAVN). The South Vietnamese government collapsed with the fall of Saigon in April 1975 and north and south Vietnam were subsequently unified under communism as the Socialist Republic of Vietnam.