Ah yes, the radar destruction stage. Took me about 6 tries before I got the hang of it. Use missles, fly up on your target fairly quickly, but hold off just enough, following the countdown. When you get down to 10, speed up on the target, and launch around 1 or 2. Once you get a feel for it, you'll be fine. If you get there too quickly, just do some slow turns until its time. Fair warning, there is alot more to the mission than that.