What's with those big helmets?

world WW2 navy naval US navy ww2 navy british navy johnny johnson american battleships american navy us naval us navy helmets ww2 helmet helmets war helmet helmet collection ww2 helmets ww2 helmet collection ww2 helmets blue helmet color helmet collectors navy funny funny navy usa navy funny naval helmet big helmet US Navy Mk II talker helmet talker naval talker naval communication join the navy in the navy usa ww2 ww2 helm helmets of ww2