What is the walkthrough for phantom sniper?

1.Shoot the guy with red scarf.

2.Shoot the two on left plus right in head then shoot block thing above guy in middle.

3.Shoot the tyres of the car then shoot the guy with weird hat.

4. Shoot the electric box. Kill the guard on the left. Then shoot the one on the right.

5. Shoot the helicopter just right of the nose.