Command and Conquer 3 Walkthrough NOD Mission 1, Goddard Space Center

Start by taking your fanatics northeast and destroy the wall. Afterward, sneak the saboteur through the crack to capture the command post. With that done, a squad will be airlifted to the location southeast of the GDI barracks and power plants. Move your way to the northwest, using the fanatics against the barracks. Reinforcements will continue to drop in to the start location. Use them to increase your numbers.

When the power plants are destroyed, you'll be told to destroy a second set to the northeast. Do so with your fanatics, using your other forces if necessary. A shadow team will arrive. You must use it to land next to the final power plant to the northeast. Head straight there and you should be safe. Use the explosive charge ability on it and it'll go up in smoke. Along the way, you might have noticed a reinforcement bay that can be captured.

While you were playing with the shadow team, a few more saboteurs should have arrived. Use them to clear the way toward the reinforcement bay to the northeast. Send the saboteur in behind to capture it. With that done, all you must do is send the rest of your saboteurs to destroy the A-SAT uplink.