It was CS gas, which is a type of tear gas, that was used against those in tunnels in the Viet Nam conflict. It did not "suck oxygen" out of the tunnels, because there was nothing that would do that. Instead, the CS directly affected the occupants. Use the link below to learn more.
probably the flamethrower because it was never used before then and has never really been used again The Flamethrower was used quite a bit during the Vietnam war because of the Viet Cong and NVA tunnels, and fortifications in the jungles.
Viet Cong
an elaborate system of tunnels
The South Vietnamese referred to Communists LIVING in "South Vietnam" as the Viet Cong. Not to be confused with enemy soldiers entering South Vietnam FROM North Vietnam, the NVA (North Viet Army).
The need to move under ground commenced when the need to move safely and with stealth was needed. US forces used air power extensively. Underground systems provide physical safety and unseen movements from aircraft.
Rolling thunder was an air campaign over North Vietnam; most Viet Cong lived in South Vietnam. The few in NV, however, made tunnels.
Cong is short for Viet Cong. The Viet Cong were the communist guerrilla forces backed by North Vietnam when they fought against South Vietnam during the Vietnam War.
probably the flamethrower because it was never used before then and has never really been used again The Flamethrower was used quite a bit during the Vietnam war because of the Viet Cong and NVA tunnels, and fortifications in the jungles.
Viet Cong
Vietnam could be considered as being synonymous to Viet Cong.
an elaborate system of tunnels
an elaborate system of tunnels
Cong Hau. Vu has written: 'Fruit-trees in Vietnam'
viet cong.
Cong Son Trinh was born in 1939, in Vietnam.
The South Vietnamese referred to Communists LIVING in "South Vietnam" as the Viet Cong. Not to be confused with enemy soldiers entering South Vietnam FROM North Vietnam, the NVA (North Viet Army).
The need to move under ground commenced when the need to move safely and with stealth was needed. US forces used air power extensively. Underground systems provide physical safety and unseen movements from aircraft.