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.
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The citizens of North Vietnam used tunnels as forms of "Air Raid" shelters, much as Great Britain did at the time of their "Blitz" during WWII. Communist forces (Viet Cong) used tunnels to store ammunition, medical supplies, moveable hospitals, and troop staging areas, in South Vietnam.
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.
No not like in WW1 however there were many tunnels dug by the north to aid in the fight against invading forces
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.
The Mustang was not deployed in Vietnam. It was used in the Korean war.
During the Vietnam war the Vietcong made a tunnel network under Vietnam which they used for communication and supply routes. When the American troops found the entrance to one of these tunnels they would send one soldier down into the tunnel armed only with a gun, a knife, a flashlight and a piece of string. These soldiers were called 'tunnel rats'. They would explore the tunnels and then bring any papers or information back to the rest of his troops at the entrance to the tunnel. Many 'tunnel rats' were killed while down in the tunnels as the Vietcong set booby traps to kill the 'tunnel rats'.