Navies are rearming their magazines, not just their hulls. Medium-calibre gun ammunition, decoys and countermeasures, torpedoes and ship-launched interceptors all sit in the same strained supply chains as land ammunition, and NATO shipbuilding backlogs make the timing worse. This hub collects ISC's naval-domain coverage: NSPA naval ammunition frameworks, gun and decoy tenders, submarine and frigate programme analysis where the weapons fit matters, and the industrial base behind ship-delivered ordnance.