5 USC 4102 - Exceptions; Presidential authority

(1) This chapter does not apply to
(A) a corporation supervised by the Farm Credit Administration if private interests elect or appoint a member of the board of directors;
(B) the Tennessee Valley Authority; or

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(C) an individual (except a commissioned officer of the National Oceanic and Atmospheric Administration) who is a member of a uniformed service during a period in which he is entitled to pay under section 204 of title 37.
(2) This chapter (except sections 4110 and 4111) does not apply to
(A) the Foreign Service of the United States; or
(B) an individual appointed by the President, unless the individual is specifically designated by the President for training under this chapter.
(b) The President, at any time in the public interest, may
(1) except an agency or part thereof, or an employee or group or class of employees therein, from this chapter or a provision thereof (except this section); and
(2) withdraw an exception made under this subsection.

However, the President may not except the Office of Personnel Management from a provision of this chapter which vests in or imposes on the Office a function, duty, or responsibility concerning any matter except the establishment, operation, and maintenance, in the same capacity as other agencies, of training programs and plans for its employees.