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South Vietnamese President Ngo Dinh Diem begins campaign against political dissidents.
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Beginning of Communist insurgency in the South.
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Weapons and men from North Vietnam begin infiltrating the South.
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American aid to Diem increased
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Number of US military advisors in South Vietnam rises to 12,000
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Viet Cong, the communist guerrillas operating in South Vietnam, defeat units of the ARVN, the South Vietnamese Army.
