If you want to Assault a group of Terrorists I suggest you throw smoke then tell your squad to fire on the Enemies and go around make sure no one sneeks up on you then throw a Gernade and if they don't die then shoot a M203 or use Suppressive Fire.

When you enter your nickname as yankee talk to the first guy you see at M16 marksmanship, and he will tell you to stay away from his woman.

-in special forces you always want a scope, never go without one, there are many enimies that will take you by surprise if you don't take them out before they flank you.
-in every level your best advice is not to stand in a firefight, ull either get hit or killed and if you play it alot like me, you'll understand how annoying the red on your screen is
-in the last sniper level, on the bridge, the best advise I can give you is to shoot,run,reload,repeat.
-as a grenader don't be afraid to use alot of grenades, you can get more from your superior officers
-you have an almost infininite suply of ammo, just got to a comrade and press A same with bandeges