Here we have pictures of the Sikorsky H-37 Mojave.
The USMC had a detachment of these in Vietnam during 1966-67.
They were a great lumbering beast that made a horrific noise with their two huge 18 cylinder engines in pods out from the body.
Their call sign was "Junkman."
This last picture is of the H-37 with its massive front clam-shell doors wide open to receive or discharge cargo. This beast could swallow a jeep.