WAegis Combat System
WAegis Ballistic Missile Defense System
WArmored Box Launcher
WASM-N-8 Corvus
WDepth charge
WHedgehog (weapon)
WArmament of the Iowa-class battleship
WMagnetic anomaly detector
WMark 11 missile launcher
WMark 13 missile launcher
WMark 26 missile launcher
WTartar Guided Missile Fire Control System
WMark 92 Guided Missile Fire Control System
WMousetrap (weapon)
WNaval mine
WNew Threat Upgrade
WOperation Bumblebee
WRIM-2 Terrier
WRIM-8 Talos
WRIM-24 Tartar
WRIM-67 Standard
WRIM-174 Standard ERAM
WRUR-4 Weapon Alpha
WRUR-5 ASROC
WShip gun fire-control system
WSpar torpedo
WStadimeter