We have 5 or 6 URL Os in my squadron that have tattoos visible in short sleeve uniforms.
Working regularly with folks of all ranks from what I have seen it is still a rarity to see O's with visible tattoos.
Besides having visible tattoos wasn't really the topic of conversation... it was tattoos, and tattoos on officers in general.
If I can't see them how the heck would I know? More importantly, why would I care?