Why were loudspeakers used during the Vietnam War?

Question

I was watching a movie that took place in Vietnam War and saw that they put large loudspeakers on tanks, boats and even on helicopters. On another TV Series, Generation Kill that took place in Iraq War, they don’t have such things. Soldiers usually sing by themselves.

I’m wondering:

* what was the purpose of loudspeakers?
* why they don’t use it anymore?

In: 219

Answer 1

Someone correct me if I’m wrong but I remember reading that the US would play certain things on loud speakers in an attempt to mentally affect the Vietnamese soldiers. Things like the voices of “ghosts” of dead Vietnamese soldiers who talked about how surrendering would have been better than dying and other morbid stuff like that, in reality it was just psychological warfare.