If in an emergency the President considers it urgent, a temporary installation or fortification may be built on private land if the owner consents in writing.
(Aug. 10, 1956, ch. 1041, 70A Stat. 591; Pub. L. 91–393, § 5, Sept. 1, 1970, 84 Stat. 835; Pub. L. 116–283, div. A, title IX, § 923(e)(18), Jan. 1, 2021, 134 Stat. 3819.)