32 CFR 1903.7: Trespassing.
(a) Entering, or remaining on any Agency installation without proper authorization is prohibited. Failure to obey an order to leave given under this section by an authorized person, or reentry or attempted reentry onto the Agency installation after being ordered to leave or after being instructed not to reenter by an authorized person under this section is also prohibited.
(b) Any person who violates the provisions of this part may be ordered to leave the Agency installation by an authorized person. A violator's reentry may also be prohibited.