Look for an area with plenty of space in front of you and a reasonable space behind you, such as under the stairs in the tank hangar. Face the door at the other end (the room with the SOCOM suppresser) and choke a guard until he is knocked out. Place a Claymore once he drops to the floor and run a short distance back. Take out your FA-MAS and point it at the guard (this is easier with Bandana) and fire, even if he is not up. When he gets up, he will fly across the screen so fast it is funny to see. To make it funnier, look at him in first person view or at the radar.