Seek and Destroy Codes -

1000 Gold:
Submit the password KWNOHIRO at the suspicious looking pink tank in first town.

Boundbomb weapon:
Submit the password KKHWEEEE at the suspicious looking pink tank in first town.

AirGatling weapon:
Submit the password GSASINRI at the suspicious looking pink tank in first town to unlock the AirGatling weapon for the sub-weapon B configuration. It is for shooting down aerial targets only.

Grand Flag:
Submit the password ODGRITRO at the suspicious looking pink tank in first town.