Ok this is Healz. I have done some thinking and now that I think about it do the round-ended cylinders go all the way on the helicopter? If so the one in the game is probably the CH-47 Chinook. I have some pictures anyway of it to post.
"The Bell AH-1 HueyCobra (Model 209) was developed as a 'dedicated' gunship during the Vietnam War, based on experience with the UH-1 series. The large cabin of the utility aircraft was replaced by a slender fuselage, seating the gunner and pilot in tandem. This arrangement also reduced drag, and the chances of the aircraft being seen and hit by enemy troops directly in front." Roy Braybrook in the Pocket Book of Aircraft, published by Kingfisher Books Limited, 1987.
Just in case you don't have a civilopedia for the AH-1 HueyCobra. I will now post the pictures of the CH-46 SeaKnight. Picture 1 is coming up.