I'm going to break up with my girlfriend right after her brother got deployed
What is your reason for wanting to break up with her?
I want to break up with anyone who is related to military.
You have a right to have your own beliefs but you cannot judge her for something her brother did and she needs you on her side during these times. It would not be good to abandon her during this time and you might regret it later.
That's stupid. What if who has the most rights is me?
Well if you want to make the decision to break up with her it is your choice. Just know that her brother's decision to be in the military has nothing to do with your girlfriend.