They didn't. The VC were a "token" force after they were nearly destroyed during the 1968 Tet Offensive. The NVA won the war, when they over ran the Republic of South Vietnam with T54/55 medium tanks in April 1975.
By their determination. They wouldn't give up...!
The Vietcong were well supplied with Soviet military technology to counter that of the US; in addition, they were able to improvise simpler but effective weapons. And lots of them died. Remember, there were roughly a million Vietnamese deaths in the war, as compared to a mere 50,000 for US soldiers. Clearly, American military technology was very effective. The Vietnamese paid a very high price for their military victory.
Not being able to find the Vietcong's. Vietcong's spent the day hiding, which restricted the American Troops attacks.
They didn't. The NVA won the war when they drove their tanks thru the South Viet capital.
Spain and such local supporters as they were able to recruit.
by helping solders
Luck and willpower.
During world war II the American military was in need of ABLE bodied men. If you loose a lung you will not be ABLE to breath.
Apparently, there were not any restrictions for that particular force; if they were physically able enough to do the job, they were VC.
It seemed to prove that America was not winning in Vietnam.
He took farmers and made them into a fighting force able to fight the British. They were fighting the most powerful army of its time.
Sparta was best known for its military, because they expected everyone to be strong and able to fight and suffer pain without complaining.