What do I call my drill sergeant? Each branch of service has a different name for that person that's yelling at you, so let's go ahead and review them now. The army calls them drill sergeants. The navy calls them recruit division commanders or RDCs. The air force calls them military training instructors, they refer to MTIs or just TIs. And the marines call them drill instructors; do not call them drill sergeants, they do not like that. Well, they don't like a lot of things, but really, don't call them drill sergeants. The coast guard calls them company commanders. And they all have a common goal -- to make you never forget them, and they're good at it. They're responsible for training you to military standards in terms of discipline, physical fitness and weapons training. They are all non-commissioned officers too, so sergeants. Treat them with respect, but don't expect any in return.