Time to start hunting down a few of those weird TIE variants that popped up in the last mission. For this run, you're going in with Z-95 Headhunters armed with Ion torpedoes. Why they couldn't have sent some old Y-Wings rather than burning through their limited stock of Ion torpedoes is a question for high command. We just do as we're told.
The mission is to disable at least one each of all enemy craft attacking the bait convoy. Keep in mind that this includes the Escort Transports! The modified TIEs go down easily, so you'll want to save at least three or four torpedoes for the ETRs. Those things will chew your ship up with alarming speed!
Take your time, and be patient making runs at the ETRs, and you'll eventually get their shields down. Then close to point-blank range, and fire a pair of torpedoes to disable them.
All that's left then is to wait for the Heavy Lifters to haul one of each type out of the combat zone. Clean up the rest of the disabled fighters, and head for home to learn what secrets have been found out about these craft.