Both birds were assigned to the 1157th Avn Co(Attack helicopter), later Co. D 40th Avn Bn of the Colorado Army National Guard in late 1975 and were still there when I was discharged in 1980.
You were right about the tail number 66-15145 and was my assigned bird, configered as a heavy hog. I believe but could be wrong that it had been upgraded to M standards. I have just wondered what it's fate is/was.
While not my assigned bird, I did crew it on many occasions. We got it from depot(Pensacola) and it flew with that unit until the hours logged sent it back to depot. She was a great bird and again I've wondered what happened to her.
66-16610, photo taken by a friend of mine, was crewing her at the time
Jon, thanks for the info, anything further you find would be appricated