[kiiski]

I assume it's the same in all militaries (in Finnish Defence Forces, when talking to superiors you're always supposed to begin with "sir/ma'am <his/her rank>, <my rank> <my last name>" (in reality people are rarely that formal after basic training)). I always assumed it was mainly to ensure that the other person knows who you are. It's certainly helpfull when you go as an NCO to a new unit and need to learn everyones names.