1950: CIA Begins Secret Armed Infiltration Missions into Communist-Controlled North Korea
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From a secret internal history commissioned by the CIA in 1968, recently declassified via FOIA: "In the late summer of 1950, an armed CIA-Korean reconnaissance team began making regular night landings on the enemy east coast"
Source: CIA (1968), The Secret War in Korea: June 1950 to June 1952. US Central Intelligence Agency