Where—
(1) any employee of the Lighthouse Service has died or shall hereafter die from non-service-connected causes after fifteen or more years of employment in such service, and
(2) the surviving spouse of the employee has not since remarried,
(Aug. 19, 1950, ch. 761, § 2, 64 Stat. 466; Pub. L. 85–351, § 1, Mar. 28, 1958, 72 Stat. 49; Pub. L. 89–670, § 6(b)(1), Oct. 15, 1966, 80 Stat. 938; Pub. L. 90–163, § 1, Nov. 29, 1967, 81 Stat. 518; Pub. L. 90–167, § 1(b), Nov. 29, 1967, 81 Stat. 520; Pub. L. 98–557, § 15(b)(2), Oct. 30, 1984, 98 Stat. 2866.)