To the best of my knowledge, RoadID tags have just what you want on them, if the SSN# is used that is the error of the person ordering them. If you are referring to military tags, personally I would not be for using them for just the reason you mentioned, the religion is personal choice, I have a request for an Episcopal priest in the on-line information at Road ID, just something I wanted in the space for unclassified/non-medical stuff.

The "none" thing presents all kinds of interesting scenarios to my warped mind

Bill