I'm mad at my mother for putting me on speakerphone with my boss
Why would your mother do that? I would feel the same as you.
She wanted to listen in on our private conversation. It had to do with military matters, and was very important.
It's reasonable to not want to others listening to a private conversation. You should tell your mother this makes you upset.
She probably just wants to tell all her friends how well I'm doing.
I suppose if I had a son like you, I would probably brag and show off how successful you are. Maybe go easy on your mother because, I guess, you make her really proud.