What should I do?

My husband recently decided to join the Marines (after trying to debate army and air Force) and my mom (being an army wife) is basically trying to bully me into making my husband choose air Force instead of Marines...

I'm fine with any branch of the military, I was an army kid so I kind of know what to expect. But I feel like if he fully goes through with this my mom will be upset with me. (His mom already doesn't want him to join the military at all)