Communication code at WW2~Korean war

I know some communication code of modern air force. Splash, bandit, Fox one/two/three, winchester and etc... However, I don't know when it started.

For example, US pilots shouted "Splash bandit!" when they shot down enemy in Korean war? or "Winchester" when they shot the gun?

If anyone who have the informations about ww2~korean communication code, please open it to us...