((a)) There are in the Army the following officers:

((1)) Chief of Engineers.

((2)) Surgeon General.

((3)) Judge Advocate General.

((4)) Chief of Chaplains.

((b)) Each officer named in subsection (a), except the Judge Advocate General, shall be appointed by the President, by and with the advice and consent of the Senate, from officers above the grade of major who—

((1)) have shown by extensive duty in the branch concerned, or by similar duty, that they are qualified for the appointment; and

((2)) have been recommended by a board under subsection (e).

((c)) An officer appointed under subsection (b) normally holds office for four years. However, the President may terminate or extend the appointment at any time.

((d)) Each officer named in subsection (a) shall perform duties prescribed by the Secretary of the Army and by law.

((e))

((1)) Under the supervision of the Secretary, the Chief of Engineers may accept orders to provide services to another department, agency, or instrumentality of the United States or to a State or political subdivision of a State. The Chief of Engineers may provide any part of those services by contract. Services may be provided to a State, or to a political subdivision of a State, only if—

((A)) the work to be undertaken on behalf of non-Federal interests involves Federal assistance and the head of the department or agency providing Federal assistance for the work does not object to the provision of services by the Chief of Engineers; and

((B)) the services are provided on a reimbursable basis.

((2)) In this subsection, the term “State” includes the several States, the District of Columbia, the Commonwealths of Puerto Rico and the Northern Mariana Islands, territories and possessions of the United States, and Indian tribes.

((f))

((1)) The Surgeon General serves as the principal advisor to the Secretary of the Army and the Chief of Staff of the Army on all health and medical matters of the Army, including strategic planning and policy development relating to such matters.

((2)) The Surgeon General serves as the chief medical advisor of the Army to the Director of the Defense Health Agency on matters pertaining to military health readiness requirements and safety of members of the Army.

((3)) The Surgeon General, acting under the authority, direction, and control of the Secretary of the Army, shall recruit, organize, train, and equip, medical personnel of the Army.

((g)) For each office to be filled under subsection (b), the Secretary shall select a board of five general officers, including the incumbent, if any, of the office, and at least two officers, if available, in a grade above major general who have had extensive service in the branch concerned. The Secretary shall give the board a list of the officers to be considered and shall specify the number of officers, not less than three, to be recommended. The list shall include—

((1)) the name of each officer of the Regular Army who is appointed in, or assigned to, that branch, and whose regular grade is colonel;

((2)) the name of each officer whose regular grade is above colonel, who has shown by extensive duty in that branch, or by similar duty, that he is qualified for the appointment;

((3)) to the extent that the Secretary determines advisable, the name of each officer of the Regular Army who is appointed in, or assigned to, that branch, and whose regular grade is lieutenant colonel, in the order in which their names appear on the applicable promotion lists; and

((4)) to the extent that the Secretary considers advisable, the name of each regular or reserve officer on active duty in a grade above lieutenant colonel who has shown by extensive duty in that branch, or by similar duty, that he is qualified for the appointment.