Unlimited credits: 
Create a new ship using as many credits as possible. Use the "Export Ship" option
after building is completed. Return to the Main Menu and restart the game using a
new Admiral name. Return to the fleet screen and use the "Import Ship" option to
retrieve the newly created ship. De-commission the ship after it is added to the fleet
to gain its value in credits. Repeat this process to accumulate an unlimited number of
credits.