36 CFR § 327.14 - Public property.
(a) Destruction, injury, defacement, removal or any alteration of public property including, but not limited to, developed facilities, natural formations, mineral deposits, historical and archaeological features, paleontological resources, boundary monumentation or markers and vegetative growth, is prohibited except when in accordance with written permission of the District Commander.
(b) Cutting or gathering of trees or parts of trees and/or the removal of wood from project lands is prohibited without written permission of the District Commander.
(c) Gathering of dead wood on the ground for use in designated recreation areas as firewood is permitted, unless prohibited and posted by the District Commander.
(d) The use of metal detectors is permitted on designated beaches or other previously disturbed areas unless prohibited by the District Commander for reasons of protection of archaeological, historical or paleontological resources. Specific information regarding metal detector policy and designated use areas is available at the Manager's Office. Items found must be handled in accordance with §§ 327.15 and 327.16 except for non-identifiable items such as coins of value less than $25.