1000 Gold
Enter "KWNOHIRO" as a password at the suspicious looking pink tank in the first town.

Boundbomb weapon
Enter "KKHWEEEE" as a password at the suspicious looking pink tank in the first town.

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

Grand Flag
Enter "ODGRITRO" as a password at the suspicious looking pink tank in the first town.