Fast Eater
Eating with a soldier or even an ex-military can be a little faster than you are accustomed to. This is because they are used to eating their meals in record time. Their time in service has trained them to do this because they always had to get back to their post, especially in a war zone. It will be hard for them to go back to how they used to eat pre-military.
Military Jargon
You may have heard phrases such as “affirmative” or “negative,” and “roger that” in computer games and in movies. However, this is normal talk for soldiers even after they have left the military. Once they have learned it, they don’t forget it.