Press T during game play, then activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
Enable extra zoom level on lower-level machines - eyeofgod
Mission select1 - saladtossed
Build any unit2 - twobyfour
Faster unit ordering - hermes
Shoot Jeeps instead of missiles - donkeys
Full map - morningafter
Build anything without a Command Center or Complex - gimmiegimmie
God mode - unclejohn
$10,000 added to resources - chaching
Increased armor - mrmuscle
Decreased enemy armor - bigsofty
Increased speed - coffee
Decreased enemy speed - beer
Increased firepower - shaft
Decreased enemy firepower - shank

NOTE 1: Enable the code, exit the current mission, and press CTRL + H + W at the main menu. Then, click on "Load" and select any mission.
NOTE 2: Valid names include dragoon, centre, defence, and other designations used in the game.