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Originally posted by Hawk
There are two types of US plates, any other type of license plate is someone trying to screw with you:
For standard GSA generic fleet license plates.
For DoD plates, but the "D" can be replaced by a number of letters to signify department.
The GSA "generic" plates are what the government calls "intra-agency", or nonspecific license plates assigned to the fleet. This is signified with a "G" and a diagonal number, usually indicating the type of vehicle (van, small sedan, medium sedan, etc) followed by a five digit identifier.
The other plates are agency specific. "D" for defense, "I" for intelligence, "E" for department of energy, etc.
For a full list check Google.
[EDIT] Just FYI, the first picture is a snapshot of a real license plate, the second one is my rendition on photoshop of a license plate since I couldn't get a picture of that kind.
[edit on 7-8-2004 by Hawk]