Section, Pub. L. 93-400, Sec. 24, as added Pub. L. 99-234, title II, Sec. 201, Jan. 2, 1986, 99 Stat. 1759; amended Pub. L. 100-679, Sec. 12, Nov. 17, 1988, 102 Stat. 4070, related to limits on allowable travel expenses of Government contractors