Lieutenant welcomed the new servicemen at the campsite door: "Dear young men, welcome to join the army. You are officially servicemen from now on, and the army is your home. You will feel at home here."
A new serviceman sat down on the ground right away, and started smoking.
Lieutenant: "Hi, why do you sit down on the ground?"
New serviceman: "At home, I liked to sit down on ground and smoke."
Lieutenant thought a bit and continued: "Wonderful, my boy. This is your home, and go help your brothers to wash dishes in cafeteria after smoking."