Chris,
The UH-1E is the Marine version of the Huey used in Vietnam as Grandad said. The first Echos off the line at Bell were based on the B model, while all later Echos were based on the C model Huey. The major differences between the Echo and the B/C models were aluminum frame (Echo) vs. magnesium frame, rotor brake on the echo, different communication equipment (i.e. different instruments), and the rescue hoist mounted above the right cabin. As Grandad said these were usually removed in country, however, the housing for the hoist remained and identifies UH-1E, UH-1L (Navy), TH-1L (Trainers), and HH-1K (Rescue) helos from all Army Hueys. Check out Mel's thread that we kinda hijacked to talk about these variants:
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The other major difference between the UH-1E and their Army cpounterparts was armamant. I just posted info on the TK-2 (Temporary Kit 2) system on another thread the other day. But basically the Army used the M156 universal mounting system which could be used to mount rockets and guns. On Army birds the guns were outboard and the rockets were inboard. The TK-2 system was just the opposite with the guns mounted inboard and the rockets outboard. The TK-2 system allowed the Marines to mount rocket pods intended for use with fixed wing aircraft. That is why many UH-1E pics show white rocket pods. The inboard gun system usually consisted of a pair of M60C's. Some UH-1E's also carries the TAT 101 turret with twin M60's in the nose of the aircraft. There are a LOT of details that you can get into with regards to Hueys. My advice is to get a big cup of coffee, set down at your computer and read through all the Huey threads here. There are a lot of guys with diverse backgrounds that contribute to this site. we are fortunate to have several VN vets to help keep us on our toes. On the first page of the Vietnam Hueys thread is a list of refs with info on each that I have used. I would get the Squadron UH-1 Gunships Walkaround as it has quite a few pics of Echos in it. In fact, here are some of them that I scanned and posted elsewhere on this site.
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Good luck with your build and let us know how it goes.
Ray