This is a Sources Sought Notice for planning purposes, not a solicitation, to identify qualified sources for a potential Firm Fixed Price IDIQ contract to provide life-cycle sonar maintenance for NAVOCEANO’s T-AGS 60 class ships, USVs, AUVs, and HSLs. Services will be performed at the John C. Stennis Space Center in southern Mississippi, supporting a global fleet operating 24/7. The anticipated contract, if awarded, would have a five-year ordering period estimated to begin on or around 26 March 2027. No budget amounts are specified in this notice. Interested parties should submit capability statements and past performance information by the specified response timeline.