Star Wars: Battlefront II/First Line of Defense

Destroy the enemy frigates
Start out as a pilot (always a good choice in space battles) and jump in a V-Wing. The V-Wing spawn is on the far left of the hangar, as you face the outer shield. Look for the yellow objective arrows to tell you where the 2 frigates are. Make a bombing run on one of them, dropping all your bombs; then circle around to the next one, because by the time you are in range, your bombs will be reloaded. Continue alternating frigates until they have both been destroyed.

Destroy the enemy Heavy Turrets
Your first space mission that requires a little skill. Bombing these things is difficult because of the bombs' tendency to follow the laws of gravity. You have to be within 200 meters of the guns to be able to hit them with a bomber's payload. If you elected to fly any of the other ships, you should be able to fire directly into the turrets without getting close. Regardless, just unload into one of them and circle around for the next one.

Land a LAAT Gunship in the enemy hangar
Fly your bomber back to your hangar and get in the LAAT that's marked with the objective arrow. You can wait a few seconds for other units to get in, but it's not really necessary. Fly it straight in, without trying to avoid any sort of missiles; the ship's armor will be sufficient to deter any attempts to destroy you. Landing is the hard part, however. Fly slowly as you approach the enemy hangar, and see if you can make it inside without banging against anything. If you do, be prepared to adjust your velocity and vector depending on which direction you're pointed. Landing the ship directly on top of the yellow marker isn't important, simply land it and secure the ship (meaning keep it in the hangar for about 30-45 seconds).

Destroy the Life Support and Engines
Chances are you're a pilot right now. Don't worry, they can handle this job just as well as the Marines. Get out of the gunship and make your way towards the control room. When you come to the door, DON'T GO IN. It's going to be packed with enemy units, not to mention auto-turrets in every room. When you're ready, run into the room and directly into one of the side rooms, whichever is closer. Shoot the auto-turret and place a time bomb on either the Life Support or the Engines (whichever room you're in). Continue to return fire at whatever enemy units assault you. It takes 2 time bombs to destroy each system. Of course, if you die, feel free to respawn at the LAAT as a Marine. Then you can defend yourself against infantry with your rifle, and just fire rockets instead of laying time bombs.

Secure the Kashyyyk Battle Plans
The plans are in the back room of the enemy's control center. Pick them up and run. Just run outside to the hangar, where there is more space to get away. If possible, take a droid fighter (Tri-fighter, specifically) and fly it back to your hangar. If you can't seem to get a droid ship, your gunship will work, though you must be extra careful to make a successful landing. If you happen to get shot down or if you botch the landing, you'll have to fly a ship all the way back to the enemy hangar and retrieve the plans again.