(subclass MilitaryShip Ship) | Military.kif 187-187 | Military ship is a subclass of ship |
(subclass MilitaryShip MilitaryWaterVehicle) | Military.kif 188-188 | Military ship is a subclass of military water vehicle |
(subclass AircraftCarrier MilitaryShip) | Transportation.kif 2457-2457 | Aircraft carrier is a subclass of military ship |