Bell UH-1 family. Models feature detailed interiors, rotating main and tail rotors with adjustable blade pitch, opening crew doors, sliding main cabin doors (with swing open auxialiary main cabin doors on UH-1D and UH-1N), and detailed armament (UH-1B and UH-1C).
http://mocpages.com/moc.php/407433 UH-1B "Huey Hog"
http://mocpages.com/moc.php/407611 UH-1C "Huey Hog"
http://mocpages.com/moc.php/407499 UH-1D Huey Medevac
http://mocpages.com/moc.php/408376 UH-1N Twin Huey
http://mocpages.com/moc.php/407500 UH-1D Huey "Slick" dropping off air cavalry troops in Vietnam