Section, added Pub. L. 100–180, div. A, title VI, § 614(a)(1), Dec. 4, 1987, 101 Stat. 1093; amended Pub. L. 100–456, div. A, title VI, § 624(a), Sept. 29, 1988, 102 Stat. 1984; Pub. L. 101–189, div. A, title VI, § 653(c)(1), Nov. 29, 1989, 103 Stat. 1462, related to travel and transportation allowances: transportation incident to voluntary extensions of overseas tours of duty.