10 USC § 192. Defense Agencies and Department of Defense Field Activities: oversight by the Secretary of Defense
(a) Overall Supervision.—(1) The Secretary of Defense shall assign responsibility for the overall supervision of each Defense Agency and Department of Defense Field Activity designated under section 191(b) of this title—
(A) to a civilian officer within the Office of the Secretary of Defense listed in section 131(b) of this title; or
(B) to the Chairman of the Joint Chiefs of Staff.
(2) An official assigned such a responsibility with respect to a Defense Agency or Department of Defense Field Activity shall advise the Secretary of Defense on the extent to which the program recommendations and budget proposals of such agency or activity conform with the requirements of the military departments and of the unified and specified combatant commands.
(3) This subsection does not apply to the Defense Intelligence Agency or the National Security Agency.
(b) Program and Budget Review.—The Secretary of Defense shall establish procedures to ensure that there is full and effective review of the program recommendations and budget proposals of each Defense Agency and Department of Defense Field Activity.
(c) Periodic Review.—(1) Periodically (and not less often than every two years), the Secretary of Defense shall review the services and supplies provided by each Defense Agency and Department of Defense Field Activity to ensure that—
(A) there is a continuing need for each such agency and activity; and
(B) the provision of those services and supplies by each such agency and activity, rather than by the military departments, is a more effective, economical, or efficient manner of providing those services and supplies or of meeting the requirements for combat readiness of the armed forces.
(2) Paragraph (1) shall apply to the National Security Agency as determined appropriate by the Secretary, in consultation with the Director of National Intelligence. The Secretary shall establish procedures under which information required for review of the National Security Agency shall be obtained.
(d) Special Rule for Defense Commissary Agency.—Notwithstanding the results of any periodic review under subsection (c) with regard to the Defense Commissary Agency, the Secretary of Defense may not transfer to the Secretary of a military department the responsibility to manage and fund the provision of services and supplies provided by the Defense Commissary Agency unless the transfer of the management and funding responsibility is specifically authorized by a law enacted after October 17, 1998.
(e) Special Rule for Defense Business Transformation Agency.—(1) The Defense Business Transformation Agency shall be supervised by the vice chairman of the Defense Business System Management Committee.
(2) Notwithstanding the results of any periodic review under subsection (c) with regard to the Defense Business Transformation Agency, the Secretary of Defense shall designate that the Director of the Agency shall report directly to the Deputy Chief Management Officer of the Department of Defense.