He was in the United States Army as a Lieutenant Colonel, in the Office of Strategic Services, from 1942 to 1946. He was an assistant to Justice Robert H. Jackson, the United States Chief Counsel at the Nuremberg trials in 1945.
He held a military rank (Lieutenant Colonel) and served within the Office of Strategic Services during World War II. He also assisted Justice Robert H. Jackson, who was the Chief Counsel for the Nuremberg Trials.