Unlock All Chapters.
To unlock all chapters, go to the options menu and then enter code. Enter the
All Recon Points
To unlock the recon points, enter the code 0ZNDRBICRA.
Here Is Kilroy Alert
To hear "You are near a Kilroy" when you're near a hidden Kilroy drawing, enter the code SH2VYIVNZF or 4V35JZHQD6.
To unlock the American Assault and German commander as bonus online characters,
enter the code HI9WTPXSUK.