Lt. Col. Duncan Chaplin Lee (1913–1988) was a confidential senior assistant to Maj. Gen. William ("Wild Bill") Donovan, founder and director of the Office of Strategic Services (OSS), World War II-era predecessor of the CIA, between 1942 and 1946. Lee has posthumously been identified by the Venona project as the NKVD mole inside the OSS with the code name "Koch",[1] making Lee the most senior alleged spy the Soviet Union ever recruited inside the U.S. intelligence community.