hill is nearly impossible..
try it this way:
take the jeep and one men with u and drive to the cobras (man as gunner)...if u can handle the cobra it´s a great weapon.. ;-)
fly fast and low (under 20 ft..) and try to lock the scud, if u got it use the hellfire..there are 3-4 shilkas around so be careful
i think there is another cobra so u can try to take 3 men with u and command 2 in the other cobra..then formation line or whatever, ey should fly behind u, dont forget to order "fire at will"