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Dear Mr. Theuerling,
Thank you for posting your request on History Hub!
According to the WWII Chronology, 1941-1945 published by the U.S. Army Center of Military History, the China-Burma-India (CBI) Theater was split into two theaters, the China Theater and India-Burma Theater, on 24 October 1944.
American troops left the India-Burma Theater around 31 May 1945 to concentrate on the China Theater but the Office of Strategic Services (OSS) Detachment 101 mission was not complete in Burma until 15 June 1945 and was disbanded in July 1945. The Southeast Asia Command (SEAC) held a victory parade in Burma on 14 June 1945.
In the China Theater, around 13 June 1945, many areas occupied by the Japanese were abandoned. Hostilities in the China Theater were declared over on 14 August 1945.
We hope this information is helpful. Best of luck with your family research!