Throughout the 1960s the insurgency in South Vietnam gradually escalated. While denying involvement, North Vietnam had long supported the insurgency with arms, munitions, supplies, and advisers. Some small North Vietnamese Army (NVA) units were operating in South Vietnam in support of the Viet Cong (VC), the military arm of the National Liberation Front, the outlawed South Vietnamese communist party. While some of the troops and materials arrived in the south by crossing the demilitarized zone along the 17th Parallel, which separated North and South Vietnam, and others by boat, by far the most were sent through Laos and Cambodia. This was accomplished via the infamous Ho Chi Minh Trail, which North Vietnam had begun to develop in mid-1959.
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