Thanks for posting. I did find a bit more information but would be interested in more if I could get more.
William Glen Jett fought at the battle of Glorietta Pass, NM territory.) In the not too distant past, somethings belonging to those who fought there were found. I don't know where those things are archived, just saw a newspaper article about it.
William was married to Clarinda Kuykendahl. (Father-in-law: Wiley Preston Kuykendahl.)
William's gun (one of them) is at the museum at the Alamo.
Thanks for replying.