[1] The head of OSO was the Assistant Director for the Office of Special Operations (ADSO), the first to hold that title being Donald H.
[2] After the end of World War II, on July 11, 1946, at the behest of Louis Fortier and John Magruder, the National Intelligence Authority (NIA) granted the head of the Central Intelligence Group (CIG), Sidney Souers, to create within the structure of CIG a new office which would absorb personnel and functions from the Strategic Services Unit (SSU).
[1] The OSO also absorbed the clandestine activities in Latin America, previously performed by the Special Intelligence Service of the Federal Bureau of Investigation.
For instance, efforts to support the 8th Army in Korea were hindered by insufficiently trained staff, leading to a reevaluation of resource allocation to prioritize long-term espionage operations.
OSO also conducted counterintelligence operations against Soviet espionage efforts in Western Europe and the United States, alongside the FBI.