underwater
alongside
army
base
battle
blue
boat
craft
crew
deck
deep
defend
defense
dock
docked
fighter
force
guard
harbor
haven
icbm
marina
marine
military
missile
mission
nato
naval
navy
nuclear
ocean
officer
periscope
pier
port
radar
sea
ship
silent
sub
submarine
submerge
swift
torpedo
transportation
vessel
war
warfare
warship
weapon