Hey Jacilynda, I think ultimately the decision is up to you. I personally would Not want anybody in my wedding party to wear their blues. My FI and all his best friends are in the Air Force, but I would NOT want them to wear their uniforms in my wedding especially for a beach ceremony. Whatever works for you is GREAT, because it's your wedding and your pictures!
What would the rest of the wedding party wear if those 2 wore their blues?
What does your FI think about it?