32 C.F.R. § 516.15
(a) Legal proceedings requiring reporting. Actions must be taken upon commencement of litigation or administrative proceedings in which the United States has an interest. Typically, the Secretary of the Army, DA, the United States, or DA personnel are named as defendant in a lawsuit or as respondent in an administrative proceeding. A nonexclusive listing of cases in which the United States has an interest include the following:
(c) Reports to HQDA. Reports required by this regulation will be made telephonically or mailed to the responsible organization at DA. Appendix B to this part contains mailing addresses for these offices. Except in the situations described below, reports required by this chapter will be made to Litigation Division: