Select the "Enter Codes" option at the main menu. Enter one of the following codes to activate the corresponding cheat function.
Bonus online characters:
Enter HI9WTPXSUK as a code to unlock the American Assault and German Commander bonus online characters.
All recon points:
Enter 0ZNDRBICRA as a code.
Enter SH2VYIVNZF or 4V35JZHQD6 as a code. The message "You are near a Kilroy" will appear when a hidden Kilroy drawing is in your proximity.