A little suggestion for that mission...
Move around the outskirts of town with the thermal goggles on.
Stay low, and keep in the bushes so you don't get scene. Hit that 1st vehicle, then you have one more to deal with.
Stay on the outskirts of the town, and keep the momentum up. Keep your fireteam on weapon's free status, and kill anybody that pops up. (A few guys are hiding in the rocks, and a few guys come out from the buildings and start running in ur general direction.)
Staying on the outskirts on town, keep on that pathway...you'll find the 2nd vehicle further into the village, surrounded by huts on 3 of the 4 sides. Once it gets taken out, some vehicles show up that you can use to try to take the harbour. (Black Hawk, M1A1 and M2A2, all at your disposal.)