Free Mission Mode

Beat the Kingpin mission. Then, a "Free Mission" option that that allows you any mission to be played will appear at the opening menu.

Beat the game on the normal difficulty level. Then, play the game again on hard difficulty level and reach the low altitude surprise attack mission (Dead End). Now locate and destroy the four YF-23As' in the special Fox Force Four squadron south of the target. A medal and the fighter will then be awarded to you on the debriefing screen.

Beat the game with a rank of General. Then, a new option will appear.

While you are at the control configuration screen, press Select.