Duke Nukem 3D Easter Egg - Doom Trooper

1. Go to level E1 L3
2. Go to the room with the church
3. Stand right in front of the cross on the floor (not the raised level)
4. There should be a little thing that comes up a little bit, stand directly in front of it
5. Press your button to open doors (usually space bar)
6. When the lights turn red and the horizontal of the cross moves shoot out the left stained glass window
7. Go around in the secret there and you'll see him