Unlock Hints:
203mm Chain Gun:             Destroy 100 Aircraft.
2-Hull Battleship:           Kill 500 transports.
2-Hull Cruiser:              Destroy 100 transport ships.
356mm Chain Gun:             Destroy 500 enemy aircraft.
406mm Chain Gun:             Destroy 999 enemy aircraft.
46cm 60-Caliber Gun:         Destroy 100 PT boats.
Astral Railgun:              Beat level D-9 collecting all parts
                             you should get at least one.
Atomic Engine Alpha:         Destroy 100 enemy destroyers.
Atomic Engine E:             Sink 500 enemy destroyers.
Gas Turbine E:               Destroy 999 enemy destroyers.
Grian Laser:                 Sink 999 battleships.
I32-Arawashi:                Destroy 100 Carriers.
Multi-Warhead Launcher:      Destroy 100 Battlecarriers.
New Supersonic Torpedo:      Sink 999 Cruisers.
Special Warhead Torpedoes:   Kill 500 Cruisers.
Wave Gun :                   Destroy 100 superships.

Easy way to obtain the XBattlecarrier:
     To obtain the XBattlecarrier without having to sink 999 transport
ships you have to beat the game once as the Americans and continue the
game.   Simply   get  an  ''S''  Rank  on  the  C-8  mission  and  the
XBattlecarrier will be your reward.