I know a kid who went through something similar. Apparently, they're allowed a certain amount of time to phone family. Well, this kid was never particularly polite to his mother, to put it mildly. This day on the phone, he was being especially obnoxious with her. That was the first and last mistake he made in the Marines, because his drill sergeant was standing silently right behind him as he talked to mom. His mother told me later that the kid was having "a rough time" in the Marines afterward. The sergeant made sure of that in every way he could.