Generally a non-uniformed, non-formally trained, mostly non-paid soldier. Although regular Government soldiers, marines, airmen, and sailors CAN be detailed the duties of guerrillas...generally...
I guess Viet Cong did what they did because they were all for a communist government. Maybe some were part of Viet Cong because they felt betrayed by their own country. Still, this does not justify...
Guerrilla Warfare is a strategy during war that involves small groups of armed soldiers ambushing an unsuspecting enemy unit quickly then pulling out before a large fight ensues. Guerrilla Warfare is...