5 U.S.C. § 3701

For purposes of this chapter— (1) the term “agency” means an Executive agency, but does not include the Government Accountability Office; and (2) the term “detail” means— (A) the assignment or loan of an employee of an agency to a private sector organization without a change of position from the agency that employs the individual, or (B) the assignment or loan of an employee of a private sector organization to an agency without a change of position from the private sector organization that employs the individual, whichever is appropriate in the context in which such term is used.