I'm not here to say get rid of tatoos, But I'd like to see shoulder and head patches (similar unit emblems) for Sec team and bandanas or arm band for Ins team for beta testers or other cosmetics. I think it would be better than tattoos since they don't show when you have long sleeves and doesn't even show very well even when you have short sleeves.
Here are some examples:
P.S. Also, this photo reminds me that you guys really need to fix up the factory dispensed barrettes into proper folded up ones like in the photo.