I found this today and thought you might enjoy reading it. Dad was also with The Chinese Combat Command. http://www.chron.com/default/article/Thank-you-cards-from-China-pose-mystery-for-WWII-2217926.php
If anyone has information on The Chinese Combat Command, I would greatly appreciate it. I found this article googling for info. There isn't much out there about it that I can find online. There are references to it, but not much detail.,.maybe a sentence or two.The CBI website is a gem with info on Ramgarh, where they trained the Chinese. I don't really understand what the Chinese Combat Command was, especially prior to the changes made in 1945. I really enjoyed the article. Had to share it.
It's mentioned here: http://www.history.army.mil/brochures/chinoff/chinoff.htm and briefly here: http://www.ibiblio.org/hyperwar/USA/USA-C-ChinaD/ as well as here: https://books.google.com/books?id=YHdFDZwbnkkC&pg=PA399&lpg=PA399&dq=world+war+2+Chinese+combat+command&source=bl&ots=SNKomiAkjz&sig=XQdo8nmEqG40Om3tlga7FywoeLo&hl=en&sa=X&ved=0ahUKEwiZ3NWCwLrRAhWF6iYKHaXnAkQQ6AEIUzAJ#v=onepage&q=world%20war%202%20Chinese%20combat%20command&f=false https://books.google.com/books?id=_9V8DAAAQBAJ&pg=PA101&lpg=PA101&dq=world+war+2+Chinese+combat+command&source=bl&ots=wvERAAjzrz&sig=s_3oS62nT4zW3I2Jrxk7lRlB0Mw&hl=en&sa=X&ved=0ahUKEwiZ3NWCwLrRAhWF6iYKHaXnAkQQ6AEIUDAI#v=onepage&q=world%20war%202%20Chinese%20combat%20command&f=false I didn't find a specific reference in the following document but it sure looks like it should be related: http://www.milhist.net/norwich/pskelly4.pdf
Here are a couple of more links. They may or may not be helpful, but they're worth a look. https://www.archives.gov/iwg/declassified-records/rg-493-us-army-china-burma-india http://www.cbi-history.com/part_xi.html