They died or relocated.
There are large tracts of forest in Cambodia, despite the deforestation campaigns waged on Cambodia during the American(vietnam)war. During the Vietnam War, there were many forests in Cambodia, Laos and South Vietnam. Only Airmen can report on forests for North Vietnam (they're the only ones that got to observe them).
They were drafted.
The Vietnam War was fought from 1955 - 1975. Not 1954.
Great Britain was a "supportive" ally during the Vietnam War.
He died in Massachusetts in 2001.
The US went, fought, and departed.
The opposite side did win.
the first US Military personnel was killed
He died in 2001 in Masschusetts, USA.
farm and domesticate animals
Trees are cut down by what is referred to as clear cutting, allowing for the erosion of surface minerals. Hundreds of animal species are left without a home with each tree lost. Birds, lizards, and small mammals- all rely on trees for shelter and food (acorns, for example).
After the fall of Saigon he escaped to Taiwan and then to England.