Play the Russian level, "Wrecking Crew". When you start, go west to destroy the tank factory. Kill the first four Nazis, and another one will always throw a grenade at you. Pick it up, and throw it back at him. He will die. Go to the area in front of you, and let the Nazi kill you. Do this repeatedly, and you will get the "Quick Reflexes" award. This is also a good level to get the "Quick Draw" award with your pistol.