There is one sniper spot witch is in the hanger where the stairs are.

Go down the stairs and out of the hanger, if you keep walking you will see a little house type thing with a fence going around.

Half way on the fence will be 2 little posts sticking up - one small and one large.

Jump on the large one and back up as far as you can without falling off, look at the roof of the building and you will see a small black line going down it like an >l<.

Look at it and jump towards it by pressing A and immediately after B, A

It should make you float up and you can move left to right but not up and down, but before you move look at the building roof - a silver line will be going across it - don't pass it or instant death!