1991—Pub. L. 102–83 substituted “Secretary” for “Administrator” wherever appearing.

1986—Subsec. (b). Pub. L. 99–576 substituted “report to the Administrator” for “report to him”.

1969—Subsec. (a). Pub. L. 91–24 substituted “the age of twenty-three years” for “the age of twenty-one years”.