Your query piqued my curiosity so I'm working on a response for you. You'll have it soon (I'm wading through about thirty pages on the subject, which I'm trying to reduce to as few words as possible).
While you're waiting, you may want to examine old messages to see whether your subject has been addressed by others in the past. You do this by means of the search function at the top left of the main page.
You might also check out my response to Roger Myers' inquiry re the 69th AmTrac Bn. Enter 15586 in the box in the upper right of the main page labeled "Jump to", then click on "Go"