The Department of the Navy has released a Draft Supplemental Environmental Impact Statement/Overseas Environmental Impact Statement (SEIS/OEIS) for continued training and testing with SURTASS LFA sonar systems in the Western North Pacific and Indian Oceans. The document evaluates two Action Alternatives and a No Action Alternative, analyzing potential impacts on marine mammals, sea turtles, fish, and the ambient acoustic environment. The National Marine Fisheries Service is a cooperating agency. The 45-day public comment period runs June 13 to July 28, 2025, with two virtual public meetings in July. The SEIS/OEIS will support renewal of MMPA and ESA authorizations expiring in 2026.12