Here are some cheats and tips for the game Metaltech: Earthsiege.
Cheat mode:
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.