deployed across South Vietnam to oversee the departure of US forces and the implementation of the ceasefire. 200-250 VC/PAVN soldiers were based at Camp Davis (see Davis Station below) at the base from March 1973 until the fall of South Vietnam. Numerous violations of the Paris Peace Accords were committed by North Vietnamese beginning almost as soon as the United States withdrew its last personnel from South Vietnam by the end of March 1973. The North Vietnamese and the Provisional Revolutionary Government of South Vietnam continued their attempt to overthrow President Nguyễn Văn Thiệu and remove the U.S.-supported government. The U.S. had promised Thiệu that it would use airpower to support his government. On 14 January 1975 Secretary of Defense James Schlesinger stated that the U.S. was not living up to its promise that it would retaliate in the event North Vietnam tried to overwhelm South Vietnam. When North Vietnam invaded in March 1975, the promised American intervention never materialized. Congress reflected the popular mood, halting the bombing in Cambodia effective 15 July 1973, and reducing aid to South Vietnam. Since Thiệu intended to fight the same kind of war he always had, with lavish use of firepower, the cuts in aid proved especially damaging. Capture In early 1975 North Vietnam realized the time was right to achieve its goal of re-uniting Vietnam under communist rule, launching a series of small ground attacks to test U.S. reaction. On 8 January the North Vietnamese Politburo ordered a PAVN offensive to "liberate" South Vietnam by cross-border invasion. The general staff plan for the invasion of South Vietnam called for 20 divisions, it anticipated a two-year struggle for victory. By 14 March, South Vietnamese President Thiệu decided to abandon the Central Highlands region and two northern provinces of South Vietnam and ordered a general withdrawal of ARVN forces from those areas. Instead of an orderly withdrawal, it turned into a general retreat, with masses of military and civilians fleeing, clogging roads and creating chaos. On 30 March 100,000 South Vietnamese soldiers surrendered after being abandoned by their commanding officers. The large coastal cities of Da Nang, Qui Nhơn, Tuy Hòa and Nha Trang were abandoned by the South Vietnamese, yielding the entire northern half of South Vietnam to the North Vietnamese. By late March the US Embassy began to reduce the number of US citizens in Vietnam by encouraging dependents and non-essential personnel