This collection relates to Paul Lionel Edwards Helliwell who served as a captain in the U.S. Army assigned to Military Intelligence, G-2 1616, Office of Strategic Services (OSS), in the Middle Eastern and Far Eastern Theaters (Egypt, Iran, and China) during World War II. The collection contains Helliwell's original diary and a transcribed copy. He records his participation in security at the Tehran conference with impressions of Winston Churchill, Franklin Delano Roosevelt, and Joseph Stalin.