With this cheat you will be able to build commandos, S.S.M. launchers and ch-47 "Chinhook". During the game and after you build the Advanced Communications Center press y, a, b, b, a, down, a, b, b, a, down, up, then build barracks to build commandos, a heli-pad to build ch-47s and a weapons factory to build the S.S.M. Launcher.