Unknown Couple

This is a photo that was in my mother's photo album. She has no idea who they are, but obviously someone my dad knew. My dad is now deceased, so I'm left without knowing.

If you look closely, the man has a military shirt on, as there is a rank patch on his left sleeve. My dad was originally from Detroit, Michigan, served in the USMC, and lived in both Hawaii and Long Beach when he served. I'm not sure if those would be enough clues to find out who they are.

Who could they be?