Here are some tips :
Start = Place the drone (eye in the sky) in front of your team at the start of the mission (past the big rock in front of you is usually a good place) because there is heavy resistence right at the start of the level. Place squad members to the left and to the right of the big boulder, because terrorists will try to surround you. Stay behind cover, and make sure no terrorist lives before continuing your advance. Don't hesitate to use grenades. Then blow up the radar ADATS (grenades work) to the left.
Beach= Get near the truck on the beach and eliminate resistence. This section is quite straight-forward, but always check your back for terrorists that could come from behind the housings. You might want to continue the level from this position to reach the upper-section of the map. Blow the second ADATS (watch for a terrorist on an upper ledge just past the ADATS).
Facility= From the last ADATS, you should climb a path to a narrow corridor of rocks where all enemies will be in front of you and easily visible from afar (top-right of the map). Shoot terrorists inside the facility. Once you get out of the passage, check to your left as more enemies might hide there (in front of the "facility"). Once inside, I usually crouched behind a truck for a couple of seconds because terrorists would come running from outside of the facility, so progress with caution. (You could assign someone to guard the left of the facility once you're inside). Then rig the 2 tankers. I often died near the left (left on the map) tanker, because there is a lot of cover for terrorists there and they will camp and wait for you to make a move. Make sure the way is safe before rigging the tanker.
Come back to the beach for extraction.