Brainwashing is a psychological attack on the mind to a point of breakdown, where the mind is completely helpless and is willing to take in information. At this point, everything said to the person will stick to it.

Lol. Taking in information and believing and espousing it are entirely different things. One can listen, even be forced to listen and still choose to disregard and challenge it, brainwashing isn't forcing people to listen to information. Brainwashing isn't an attack, brainwashing is selling a story, and it only works as long as they're not challenged on the bullshit, yet

It was believed that when the soldiers were captured, they were not killed, instead they were indoctrinated to become followers and advocates for communism.

Sure. The CIA "believes" it was brainwashing instead of being killed. Makes sense, instead of torture, it was "indoctrination to be followers and advocates for communism". Instead of slavery, it was " indoctrination to be followers and advocates for communism". Instead of humiliation and degradation, it was " indoctrination to be followers and advocates for communism". It must be true, why would they lie, it's only the CIA.