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.