42 U.S.C. § 5149

to appoint and fix the compensation of such temporary personnel as may be necessary, without regard to the provisions of title 5 governing appointments in competitive service;

to employ experts and consultants in accordance with the provisions of section 3109 of such title, without regard to the provisions of chapter 51 and subchapter III of chapter 53 of such title relating to classification and General Schedule pay rates; and

to incur obligations on behalf of the United States by contract or otherwise for the acquisition, rental, or hire of equipment, services, materials, and supplies for shipping, drayage, travel, and communications, and for the supervision and administration of such activities. Such obligations, including obligations arising out of the temporary employment of additional personnel, may be incurred by an agency in such amount as may be made available to it by the President.

The protections, rights, benefits, and obligations provided under chapter 43 of title 38 shall apply to intermittent personnel appointed pursuant to subsection (b)(1) to perform service to the Federal Emergency Management Agency under sections 5170 and 5191 of this title or to train for such service.

section 4312(b) of title 38Preclusion of giving notice of service by necessity of service under subsection (b)(1) to perform service to the Federal Emergency Management Agency under sections 5170 and 5191 of this title or to train for such service shall be considered preclusion by “military necessity” for purposes of pertaining to giving notice of absence from a position of employment. A determination of such necessity shall be made by the Administrator and shall not be subject to review in any judicial or administrative proceeding.