Metaltech - Earthsiege

Cheat Codes:
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Start or resume a campaign from the main menu. Return to the
main menu and select the single mission option. Choose any 
mission, enter the briefing, and click on the armament option.
Select a Herc, return to the briefing, and cancel the single 
mission. Resume the campaign from the main menu, play the first
assigned mission, then save the game. 
Load the saved game to access all the Hercs, fully armed.