10 U.S.C. § 12003: Authorized strengths: commissioned officers in an active status

(a) The authorized strengths of the Army, Navy, Air Force, and Marine Corps in reserve commissioned officers, other than commissioned warrant officers and officers on an active-duty list, in an active status are as follows: Army275,000 Air Force200,000 Navy150,000 Marine Corps24,500. (b) The authorized strengths prescribed by subsection (a) may not be exceeded unless—(1) the Secretary concerned determines that a greater number is necessary for planned mobilization requirements; or (2) the excess results directly from the operation of a nondiscretionary provision of law.