For the Single Player Campaign:

The mission where you have to extract codename "Mr. Pickle". The one in the Middle East.--

This is the first mission I've run across where I'm having a bit of trouble. Stealth entry seems impossible.

I've managed to eliminate all of the exterior guards without being spotted, but as soon as I approach the exterior wall of the prison and make my way to point Charlie somehow someone spots me.

And I leave team Bravo at the starting point of the mission until I get to point Delta. Team orders are "Team Low Profile".

That's when I attempt a stealth approach.

On the all-out assault approach I do a bit better, I even manage to acquire an MGL from one of the terrorists sometimes, but when I neutralize all terrorists except for in the armory, and attempt to clear the armory, there's always a terrorist in an area where I least expect them, and the Armory is too confined for MGL fire. And my SEAL Team can't seem to ambush the Armory without getting incapacitated.

That's when one of the MGL-wielding terrorists doesn't take my whole team out.

Any thoughts on how to beat this mission?

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For the multiplayer:

Well, I don't have broadband yet. So there's nothing I can do here.