32 CFR § 263.4
Registration of vehicles
July 1, 2020
(a) Newly assigned or employed individuals who intend to operate a privately-owned vehicle at the site shall register it with the Security Police Division within 24 hours after entry on duty.
(b) Temporary registration for a specified period of time will be permitted for temporarily hired, detailed, or assigned personnel; consultants; contractors; visiting dignitaries, etc.