In Camp McCarran, you can gain entry to the monorail that goes directly to the strip. Take the long way around, and stay as close to the vending machines as possible. Follow the wall around the back way. Make sure the other soldier has his back to you. Crouch and sneak up to this soldier. You may hear the phrase indicating that if you get any closer, they will have to shoot you. However, as long as you remain hidden, it should only flash "Detected" briefly a few times. As soon as you are close enough to the door, you can go through it and take a monorail directly to the strip. This may require a few attempts. Be careful when returning to the monorail from the strip, as you will probably be shot. However, as soon as you enter the monorail, it resets, and you can again ride it back to the strip again. By using this glitch, you can bypass many annoyances and quests, and skip directly to meeting Mr. House and finding the person who shot you.