If in an emergency the President considers it urgent, a temporary fort or fortification may be built on private land if the owner consents in writing.
(Aug. 10, 1956, ch. 1041, 70A Stat. 270, § 4776; Pub. L. 91–393, § 5, Sept. 1, 1970, 84 Stat. 835; renumbered § 7776, Pub. L. 115–232, div. A, title VIII, § 808(d), Aug. 13, 2018, 132 Stat. 1839.)