Go to Underground Passage on Western Front. At the beggining of the mission, do not go through the big hole in the wall.After killing all the Germans, go back to where you started. Then keep going straight into a mine looking thing.Go back into where you started. Through four grenades into the little pit where you started. But remember to go back around the corner to avoid being blown up. After it is blown away, go straight all the way down and then turn right. Go straight into the right passage. Then you see a dance party! Go to the guy by the music table and pick up the Browning .20 gun. This is funny!