Not a bad idea, scuppy. Of course it'd have to be a thunderbird, right? image

If they used pins, probably each one would wear what symbolizes their primary responsibility, like scuppy's idea for the pilots, and probably a caduceus for the medical team members. Maybe a dolphin for the aquanauts.

Brains, Tin-Tin and Callie are supposed to be primarily various types of engineers. So what would symbolize their specialites?