[1] The purpose of these activities was the support of Vietcong in their struggle to topple the southern regime of President Ngo Dinh Diem.
Group 559 developed road lines through Laos and Cambodia that fed into various areas of northern and western South Vietnam.
This system of roads became known as the Ho Chi Minh Trail and was used under the supervision of Group 559 to infiltrate weapons, ammunition, and cadres into the South.
Within one year the force level grew to 24,000 troops and six motorized transport battalions plus engineering, anti-aircraft, and security elements.
In 1975 when the war ended, Group 559 was reorganized into 12th Corps (Binh đoàn) to rebuild Ho Chi Minh Trail into roads for economics and national defense.