Interesting! First one I've seen before but didn't have it saved.
There were definitely some changes between CAPSTONE and Roundout units. 218th for example definitely became a 1st ID roundout brigade, but before '91 nothing makes a mention of the 1st ID connection. Brigade: A History has all the Roundout units with their years and some other interesting bits about the Pentomic brigades I used for my Twilight 1964 stuff. Posting the link just for reference.
https://www.armyupress.army.mil/Port...e-AHistory.pdf