ACP-131

ACP-131 (Allied Communications Publication 131) is like a special book that helps important people from different countries talk to each other. Just like how we need a dictionary to understand words in different languages, ACP-131 is like a dictionary but for communicating with radios between people from different countries. It helps them use the same words and codes so that everyone can understand each other. This is important because different countries might use different words for the same thing, so if they didn't have ACP-131, they might not understand each other and that could be dangerous.