6 CFR 139.25: Preservation of Federal property.

All persons are prohibited from the following conduct affecting Federal property:

(a) Littering;

(b) Damaging or otherwise changing the appearance of Federal property in any way except through authorized normal and customary use;

(c) Removing Federal property without proper authority;

(d) Creating any hazard or threat of hazard on Federal property to persons or things;

(e) Throwing articles of any kind from or at Federal property;

(f) Climbing on any statue, fountain, or part of a Federal facility, or any tree, shrub, or plant on Federal property; and

(g) Using, operating, parking, locking, or storing any vehicle or personal transportation device on Federal property, except as either required by individuals with mobility impairments, or otherwise specifically allowed in designated areas.