32 C.F.R. § 22.820
(c) Grants officer's decision. In the absence of such mutual agreement, any claim of a recipient's indebtedness shall be the subject of a grants officer decision, in accordance with § 22.815(b)(2). The grants officer shall prepare and transmit to the recipient a written notice that:
(2) Informs the recipient that:
(d) Follow-up. Depending upon the response from the recipient, the grants officer shall proceed as follows:
(3) If within 30 calendar days the recipient has neither paid the amount due nor provided notice of intent to file an appeal of the grants officer's decision, the grants officer shall send a demand letter to the recipient, with a copy to the payment office that will be responsible for collecting the delinquent debt. The payment office will be responsible for any further debt collection activity, including issuance of additional demand letters (see Chapter 19 of volume 10 of the DoD Financial Management Regulation, DoD 7000.14-R). The grants officer's demand letter shall: