The new Department of Defense Common Access Card, which is replacing the standard green "military ID", has two bar codes, a magnetic stripe, a computer chip, TWO pictures, SSN, date of birth, blood type, organ donor status, and other info, but does NOT have a signature on it. It might be encoded on the computer chip, though. I know a fingerprint is.
When cashiers ask for ID, I'll flash that card and it's okay for just about all of them. I take it as proof that they're not checking your signature, only your name. I'm forced to use my driver's license for those sticklers who do want to see a signature; less than once a month that happens, though.
-Mikey
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