In the mission where you need to destroy the airplane and helicopter, Take out a grenade launcher at the beginning, and look at the control tower (top). You should se 2 windows, aim above them a bit, then launch a grenade, you should get 1 or 2 kills. Do it a bit more to the right, and you'll get the 3rd and final guy.
Last Mission ( forgot what its called, Pikes revenge or somethin
Ok I'm only telling you about the last mission because I dont think you should have any problems on the outher missions ( Theres only 13 missions before this one.)
First walk straight untill you come to a hill. On the outher side of the hill there should be a little house and four men should be guarding it take them out then look for a truck. On the outher side of the truck should be a hill go up it an there should be a a little base on top and some guys behind some sandbags but watch out because some guys will come from your right when your going up the hill. after you take them out stand in between the two stacks of sand bagsand look out away from the bunker for a little valley than go back down the hill an follow the valley it should bring you up behind anouther little base then take out all those guys than keep going to past the base and you should come to a hole in the wall of the main base ( back entrance ) but dont just run in, there is a guy with a RPG on a roof to your left when you go in. then you should see some boxes go take cover behinde them because some guys will be shooting at you. then look to the right of the boxes for a building go behinde that building then there should be anouther building beside it keep running past untill you come to some green cargo boxes than look on the roof for a sniper ( same building you killed the guy with the RPG not same spot but the same building.) than after you take him out go tword the building than once you get to the building keep goind around it then you should see a booth walk tword it untill command starts talking to you once you hear sommands voice run back to the building and wait for a tank to pull up by the booth take out the tank and the guys around it then head down the road that the tank came from as you are going down the road it will turn to the right after you go around to turn you will run into some guy take them out and look for a tower than take the guy in the tower out run tword the tower or prone to doge enemy fire once you get to the tower some guys will be to your right ( they should be behinde a fence.) take them out then walk around the tower than take out any enemys than get by the truck for cover because some guys will come out from the fenced in area kill them than run in were they came from and to the right side of the entrance through the fence for some boxes ( you will need them.) then look to your left for a missile, plant demo charges around the ventalation system of the missile than once you get them planted run behinde the boxes and just sit there untill the helicopter arrives then once the helicopter arrive, dont run to the helicopter just stay there untill it says mission accomplished.