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.