As a result of the Vietnam (Second Indochina) War (1954–75), Viet Cong and regular People's Army of Vietnam (PAVN) forces of the DRV unified the country under communist rule. In this conflict, the North and the Viet Cong—with logistical support from the Soviet Union—defeated the Army of the Republic of Vietnam, which sought to maintain South Vietnamese independence with the support of the U.S. military, whose troop strength peaked at 540,000 during the communist-led Tet Offensive in 1968. The North did not abide by the terms of the 1973 Paris Agreement, which officially settled the war by calling for free elections in the South and peaceful reunification. Two years after the withdrawal of the last U.S. forces in 1973, Saigon, the capital of South Vietnam, fell to the communists, and the South Vietnamese army surrendered in 1975. In 1976, the government of united Vietnam renamed Saigon as Hồ Chí Minh City in honor of Hồ, who died in 1969. The war left Vietnam devastated, with the total death toll standing at between 966,000 and 3.8 million, and many thousands more crippled by weapons and substances such as napalm and Agent Orange. The government of Vietnam says that 4 million of its citizens were exposed to Agent Orange, and as many as 3 million have suffered illnesses because of it; these figures include the children of people who were exposed. The Red Cross of Vietnam estimates that up to 1 million people are disabled or have health problems due to contaminated Agent Orange. The United States government has challenged these figures as being unreliable.