While Gen. Magruder did what he could to preserve the basic intelligence infrastructure within the war department, there wasn’t any operational capability to speak of between the abolition of the OSS in 1945 and the ramp up of the CIA. The SSU - CIG - OSO - CIA in the second half of the 1940s were more about preserving institutional knowledge against the efforts of the Communists in government to destroy them than they were about actual operational capabilities. The CIA wasn’t really effective until Bedell Smith took over in 1950.