The NVA

It could mean

1. The National People's Army (German: Nationale Volksarmee)- GDR.
2. The North Vietnamese Army (Vietnamese: Quân đội Bắc Việt)- Noth Vietnam.
   1. Now the People's Army of Vietnam (PAVN), (Vietnamese: Quân đội nhân dân Việt Nam)- Vietnam.
3. Not to be confused with the Vietnamese National Army (VNA; Vietnamese: Quân đội Quốc gia Việt Nam)- South Vietnam.

Sources

1. https://www.youtube.com/watch?v=94WzjgHRRHw
2. https://en.wikipedia.org/wiki/National_People%27s_Army
3. https://en.wikipedia.org/wiki/People%27s_Army_of_Vietnam
4. https://en.wikipedia.org/wiki/Vietnamese_National_Army