Hint: SOCOM Steady-Shot
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When you absolutely, positively need that first strike stealth kill, players normally call up the sighting view (i.e., using the scope). Unfortunately, the player's scope view will always be "flawed" and a sure shot is not always the case.
Here's how to make the scope view more steady. When the crosshairs are over the target's head (or what ever you want to shoot at), press SQUARE to bring up the command menu. You will (barely) be able to see if you are on target or not. If not, exit the menu and repeat the process, but if you are on target, order the team to do something that won't amount to much like "get down" or "hold position".
Now you highlight the command, press and hold X and you will fire as you leave the command menu, hitting the target where you want.