10 USC 12302 - Ready Reserve

(a) In time of national emergency declared by the President after January 1, 1953, or when otherwise authorized by law, an authority designated by the Secretary concerned may, without the consent of the persons concerned, order any unit, and any member not assigned to a unit organized to serve as a unit, in the Ready Reserve under the jurisdiction of that Secretary to active duty for not more than 24 consecutive months.
(b) To achieve fair treatment as between members in the Ready Reserve who are being considered for recall to duty without their consent, consideration shall be given to
(1) the length and nature of previous service, to assure such sharing of exposure to hazards as the national security and military requirements will reasonably allow;
(2) family responsibilities; and

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(3) employment necessary to maintain the national health, safety, or interest.

The Secretary of Defense shall prescribe such policies and procedures as he considers necessary to carry out this subsection. He shall report on those policies and procedures at least once a year to the Committee on Armed Services of the Senate and the Committee on Armed Services of the House of Representatives.

(c) Not more than 1,000,000 members of the Ready Reserve may be on active duty, without their consent, under this section at any one time.