NAVAL OPS: COMMANDER UNLOCKABLES
Bonus unlocks
You will sometimes get different items for a "A" and "S" rank in some missions. Replay them and you may find new things.
254cm Deck Guns 60-caliber
By killing 100 PT Boats.
Lucky Charm
Kill 500 Sub-marines - Recieve \"Lucky Charm\". Which reduces percentage of your ship catching fire or flooding to 0%.
30mm CIWS
By killing 100 Destroyers.
365 mm Chain Gun
By killing 999 Aircraft.
80 cm 60 cal
By killing 500 PT Boats.
AGS 203mm Cannon
By killing 999 Destroyers.
AGS 254 mm Cannon
By killing 500 Aircraft.
Atomic Engine E
Finish level F-B.
Black Dragonfly Airship
By obtaining an "A" rank in mission *G1.