In the main menu of the campaign, right click on the microphone on the left side of the screen. type "idaho." A pull down menu will appear in the top right of the screen. You can use this menu to access any of the missions within the game.

To see all of the pictures available in the gallery, go to Previous Missions at the Campaign Mode screen. Click on the Rogue symbol in the bottom corner of the screen and type: ispy.

To become invincible for one mission, type the following code at the weapon equip screen: I AM THE ACE!! This code is case sensitive and only lasts for the mission you're about to tackle.