Type  Viper on the logon screen to access all the missions. While
in a mission press:

Alt+I                   Invulnerable AHX-1
Alt+L                   Reload weapons
Alt+R                   Fix damage
Alt+A                   Show all targets on radar
Alt+X                   Crash Viper
Alt+Q                   Change flight model real/arcade
Alt+K                   Stop smoke trails
Alt+J                   Display the render rate (FPS)