To play the game without having to worry about running out of health bring up the 'Pause' menu and hold LT, RT, and 'Back' and while holding these buttons enter Y, Y, X, RB, X, LB. Only the player will receive the infinite health.

Have a 'Save File' on your Hard Drive from the following Tom Clancy games to unlock more Head Gear.

Unlock 2 New Head Gear:
Have a save file from Tom Clancy's Splinter Cell: Double Agent on your hard drive.

Unlock 2 New Head Gear:
Have a save file from Tom Clancy's Rainbow Six: Vegas on your hard drive.

When Creating a new campaign enter the code 'GRAW2QUICKFAMAS'as a name when prompted to have access to the FAMAS when playing in Quick Mission mode.