((a)) A member of the Ready Reserve covered by who fails in any year to perform satisfactorily the training duty prescribed in that section, as determined by the Secretary concerned under regulations prescribed by the Secretary of Defense, may be ordered without his consent to perform additional active duty for training for not more than 45 days. If the failure occurs during the last year of his required membership in the Ready Reserve, his membership is extended until he performs that additional active duty for training, but not for more than six months.

((b)) A member of the Army National Guard of the United States or the Air National Guard of the United States who fails in any year to perform satisfactorily the training duty prescribed by or under law for members of the Army National Guard or the Air National Guard, as the case may be, as determined by the Secretary concerned, may, upon the request of the Governor of the State (or, in the case of the District of Columbia, the commanding general of the District of Columbia National Guard) be ordered, without his consent, to perform additional active duty for training for not more than 45 days. A member ordered to active duty under this subsection shall be ordered to duty as a Reserve of the Army or as a Reserve of the Air Force, as the case may be.