5 U.S. Code § 502
5 U.S. Code § 502 is about Administrative practice; Reserves and National Guardsmen. It is under Part 1 (Administrative Procedure) Subchapter 1 (General Provisions) Chapter 5 (Administrative Procedure) of Title 5 (Government Organizations and Employees) of the Code.
Membership in a reserve component of the armed forces or in the National Guard does not prevent an individual from practicing his civilian profession or occupation before, or in connection with, an agency of the United States.