I want to know how he can have a tattoo on his wrist. I am not sure that is within regs.
It's not in regs.
He might have been grandfathered in, if he's an older Marine and got the tattoo before 2007. It's my understanding that current applicants to the command are highly discouraged to get any tattoo's regardless of placement or size and if you have a tattoo that violates Marine Corps regulations (like that one), there are no waivers.