41 C.F.R. § 102-34.160 How are U.S. Government license plates coded and numbered?
Title 41 - Public Contracts and Property Management
U.S. Government license plates will be numbered serially for each executive agency, beginning with “101”, and preceded by a letter code that designates the owning agency for the motor vehicle. The agency letter codes are listed in GSA Bulletin FMR B–8 (FMR bulletins are located at www.gsa.gov/bulletin). [71 FR 27638, May 12, 2006]
Title 41: Public Contracts and Property Management
PART 102–34—MOTOR VEHICLE MANAGEMENT
Subpart B—Identifying and Registering Motor Vehicles
License Plates
§ 102-34.160 How are U.S. Government license plates coded and numbered?