Cheat Mode
Start game as usual. During gameplay press tilde to go to console and enter the following cheats followed by [Enter].
GOD - Toggle God Mode
FLY - Toggle Fly Mode
NOCLIP - Toggle Noclip Mode
NOTARGET - Notarget Mode
KILL - Suicide
Optionally start the game with "EternalWar.exe STUFFCMDS" and you will have access to the following additional cheats.
IMPULSE 9 - Get All Weapons
IMPULSE 255 - Get All Weapons With Full Ammunition