Planned Homeland Advance Operation
The Korean Liberation Army trained with the US Office of Strategic Services (OSS) for an operation into Korea, but Japan surrendered before it could be carried out.

Provisional Government of the Republic of Korea · Public domain · Source
In 1945 men of the Second Detachment at Xi’an (under Lee Beom-seok) and the Third at Fuyang took OSS special training and formed an advance force to enter Korea in August. Japan’s surrender on 15 August came first, and the operation never took place.
Kim Gu wrote in his memoir Baekbeom ilji: "Ah! The Japanese have surrendered! For me this was less joyful news than the sky falling in." He feared that because Koreans had not won liberation by fighting Japan themselves, their voice in the postwar settlement would be weak.