Some discussion of Army Rail in Viet Nam
His son JR Clark left me a comment
My father COL Richard Paris Clark, Jr., commanded the 714th between 1968 and 1970. He kept a diary of his Vietnam tour from 1965 to 1966, where he served as chief of Movements Branch, J-4 MACV. You can read it by Google searching A Vietnam War Clerk's Diary. There are lots of mentions of TC officers and inside information regarding the big troop buildup in SVN.
https://vietnamwarclerksdiary.blogspot.com/

