The corresponding secretary you mention, Ted Van Arsdol, has a two volume work entitled
Battalion from the Mojave that covers history of the 535th from their formation to the end of the war. Unfortunately only 600 copies were printed by West Shore publications, but I did find one available on ebay:
http://compare.ebay.com/like/3900444...=263602_304692. My late grandfather J. P. Heinke was a medic and Captain with the 535th and left us a copy of the book. It's interesting to read bits of his journal in the first volume. The Col. Francis that you mention was the unit leader and was a Lt. Col at the time. They were a unit that saw a lot of action in the European theater, and were among some of the the last soldiers to leave as they were put in charge of guarding POWs after the war.