Yes Sir

I still can't get used to having students call me "Sir" all of the time.
Though not as strict as Marine Corps basic training, the cadets are
supposed to be deferential to officers as part of a paramilitary
lifestyle. They're supposed to step out of our way and address us
formally. This is quite a change from working with the students at a
Community College. Not that there aren't a few wise guys in the bunch,
but there aren't many.