10 U.S.C. § 156

(a) In General .— There is a Legal Counsel to the Chairman of the Joint Chiefs of Staff. (b) Selection for Appointment .— Under regulations prescribed by the Secretary of Defense, the officer selected for appointment to serve as Legal Counsel to the Chairman of the Joint Chiefs of Staff shall be recommended by a board of officers convened by the Secretary of Defense that, insofar as practicable, is subject to the procedures applicable to selection boards convened under chapter 36 of this title. (c) Duties .— (1) The Legal Counsel of the Chairman of the Joint Chiefs of Staff shall perform such legal duties in support of the responsibilities of the Chairman of the Joint Chiefs of Staff as the Chairman may prescribe. (2) No officer or employee of the Department of Defense may interfere with the ability of the Legal Counsel to give independent legal advice to the Chairman of the Joint Chiefs of Staff and to the Joint Chiefs of Staff.