You have John's non-regulation bracelet. I can't imagine his wristband is regulation either.

I don't think his hair follows regs, either :D Or wearing his shirt untucked half the time... Maybe he burned the rule book before Elizabeth got a hold of it.

I don't suppose we'll ever hear about those two things on the show.

Alas, no. I think the wristband is one of the Great Mysteries of SGA.