Level "Riding Out The Storm" on Rolling Thunder: Get inside the first room. On the left, just as you enter the door there is a ladder. Climb up the ladder and press X. You will yourself controlling a huge gun. Continue on. You will get outside and pass lots of machine guns. If you get in the next room climb the ladder on your left and press X. It is the same once more. You get outside, keep going, first ladder on your left, X.