This subchapter applies to—
(a)
Civilian officers and employees of—
(3)
Government corporations subject to chapter 91 of title 31 U.S.C.;
(4)
The Library of Congress;
(5)
The Government Printing Office (GPO);
(6)
The government of the District of Columbia; and
(b)
Commissioned officers of the National Oceanic and Atmospheric Administration.