5 CFR 334.106: Requirement for written agreement.

(a) Before the assignment begins, the assigned employee and the Federal agency, the State, local, Indian tribal government, institution of higher education, or other eligible organization must enter into a written agreement recording the obligations and responsibilities of the parties, as specified in 5 U.S.C. 3373-3375.

(b) Federal agencies must maintain a copy of each assignment agreement form established under this part, including any modification to the agreement. The agency may determine the appropriate time period for retaining copies of its written agreements.