Cheat Codes

From the main menu, start or resume a campaign. Now go back to the main menu and select single mission.
Choose any of the missions offered. Enter briefing, then click on armament.
Grab yourself a big hulking Herc. Return to the briefing and cancel the single mission.
Resume the campaign from the main menu, play the first assigned mission, then save.

Load the save and you'll now have all Hercs completely decked out and ready for action.