Trust The Yanks to Make A Mess of Things

The OSS, forerunner of the CIA, was, as far as I am aware and if I recall correctly, established at the urging and with the assistance of MI6, because the Americans lacked an intelligence organisation able to deal reliably at their end with the disinformation that was then being fed to the Germans through a network of double agents.

It was all rather more gentlemanly then of course, although the OSS wasted no time in turning upon its allies and subsequently supported the Viet Minh in French Indochina against the British troops (mostly Gurkha and Indian), under Major General Douglas Gracie, sent to pacify the country and disarm the defeated Japanese occupation forces. The Yanks made a mess of that as well. They made sufficient trouble in the region, however, that Gracie was forced to re-arm the Japanese POWs, bring in the Royal Artillery and use armoured cars, so that British equipped Japanese soldiers were fighting US equipped and supported Viet Minh over possession of a French colony. Gracie's force was so successful that the French wanted to award every man a medal, presumably not the Japanese. Mountbatten refused the request.

An interesting footnote to the affair was that the OSS commander in the field angrily suggested that the British force could be stopped by cutting off their Lend-Lease aid, only to be informed by his HQ that such a course was not possible as US forces in the region were being supplied by Britain.