((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:

((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.