Install this mod to skip the intro movies and go straight to the main menu when launching the game.
INSTRUCTIONS
Unzip and/or copy the entire "movies" directory and its contents from this addon into your Ground Control 2 root directory, e.g. C:\Games\GC2.
If you want to re-enable the intro movies, delete the same directory from your GC2 install and it will go back to loading the originals.