Question based on a completely unsourced throwaway mention on WIkipedia:
http://en.wikipedia.org/wiki/Korean_Liberation_Army#End_of_the_War
In 1945, the KLA was working in cooperation with the US Office of Strategic Services to train men for specialist military operations within Korea. The leading units were due to depart on August 20, with General Lee in command. However, the aspiration of the KLA to play a significant role in the liberation of Korea from Japanese occupation was not fulfilled, as Japan unconditionally surrendered to the Allies on August 15. Three days later, a helicopter carrying twenty-odd members of the KLA landed in Seoul, only to be forced back by the Japanese military, which refused to surrender until US military forces arrived.
Yes, Kim Gu, the leader of the provisional government of Korea, exile in China talks about KLA being trained and equipped by the Americans and the Chinese. From his biography, the KLA were to leave from Shandong on submarines, land with American weapons and take over strategically important places with further arms and ammunitions being dropped by the Americans from planes. He laments the fact that Japan surrendered unconditionally since Koreans would have little to no room in the negotiations, which would be different if Koreans themselves were occupying Korea (at which point he would have weight and leverage in the discussions.)