Objective 1: Get In Range & Tag 1st SAM Launcher
Get down and hide behind the crates down the hill. Use your laser designator and aim at the SAM launcher, wait for the counter to reach zero and the friendly fighter will drop bomb on it.
Objective 2: Get In Range Of 2nd SAM Launcher Before Friendly...
From here crawl your way under the trees, and avoid getting close to other enemies on the ground. When you think you're far from the 1st compound and no one can see you, quickly run down the hill until you reach the road below. Cross the road and run on the other side, check your map if your getting close to a group of guards. When this happens jump into the ocean (that's right JUMP!) and swim to the other side of the 2nd area.
Then go up the hill, check your map and get close to the 2nd SAM site.
Objective 3: Tag 2nd SAM Launcher
Use again your laser designator to tag the SAM launcher, then continue going up the hill.
Objective 4: Move To Dropzone & Collect Equipment Canister
You can avoid the enemies up the hill if you always check your map and just move around to reach the drop zone.