Note that if you try playing the appropriate mission to get a medal
it might not grant you it... I've given the mission you should play, but i haven't given you the
other requirements for getting a medal on that mission. For example, if you're playing on 'easy'
and you complete the mission and don't get a medal, try raising the difficulty to 'medium' or 'hard'... also
try destroying all ships, and completely following all objectives, also try not to call in reinforcements.