Military Jargon
It’s highly likely you’ve heard expressions like “affirmative”, “negative” or “roger that” in computer games and films. Actually, this is how soldiers speak, which they take with them even after they leave the service. It’s like learning a new language, and once you have learned it, letting it go becomes hard to do.
Cursing
It’s not their intention to be rude. However, since everyone talks that way, that’s how you talk too. No idea what we’re talking about? Then, try introducing yourself to some drill f@#&ing sergeant.