The Department of Defense, specifically the Navy, is seeking proposals for the development of the ARCTIC FOX Sentinel, a new class of implanted or embedded passive focused sensor package designed for surveillance and reconnaissance in Arctic environments. The objective is to create an air-deployable sensor system capable of detecting both manned and unmanned platforms across challenging terrains, including swamps, deserts, tundra, and water bodies, while operating autonomously in communication-degraded and GPS-denied conditions. This initiative is critical for enhancing the operational capabilities of airborne and expeditionary forces in extreme environments. Proposals for Phase I are due by June 12, 2024, with further details available on the official solicitation page at https://www.dodsbirsttr.mil/topics-app/.