underwater
warships
battle
battlecruiser
battleship
boat
cannon
combat
cruiser
defence
defend
defense
demonstrate
diesel
federation
fighter
flagman
flagship
fleet
forces
frigate
guard
gun
metal
military
mission
modern
national
nautical
naval
navy
nuclear
parade
patrol
periscope
protection
sea
security
ship
ships
silent
submarine
transportation
vessel
war
warfare
warship
weapon