I have to do some research but if I remember correctly that is a Bell Helicopter in the background. If I remember correctly they basically used the frame of the Bell 47 and skinned it and used a different rotor. I think that had three blades. Anyway I'm guessing more than anything tonight. I'll do some digging tomorrow.
Found it. I was partly correct. It is a Bell 47L. The Navy called it a HUL-7 Here is a link to a better picture.
http://images.google.com/imgres?imgurl=http://www.aviastar.org/foto/gallery/bell/bell_47k.jpg&imgrefurl=http://www.aviastar.org/helicopters_eng/bell_sioux.php&h=278&w=422&sz=36&hl=en&start=5&um=1&usg=__jY_J8GHYPMNjvW_DkfpWEqVRUSk=&tbnid=AnPo1P6jRT5QOM:&tbnh=83&tbnw=126&prev=/images%3Fq%3DNavy%2BBell%2BHUL-1.%26um%3D1%26hl%3Den%26sa%3DG
Charlie