Found another site regarding the major that seems a little more detailed, evidently Major Chin was discharged from the Chinese Air Force prior to the end of the war. Could this perhaps be due in part to his injuries? According to the site it was as a US Army Air Forces officer that he flew transports. Unfortunately it is not clear why he was discharged before the end of the war. Now I'm curious and gonna see if I can't find anything more about why.
http://surfcity.kund.dalnet.se/china_chin.htm