[1][2] Harr held two positions from 1956 to 1961, which enabled him to observe and participate in the inner workings of the National Security Council (NSC).
[1][3] This position enabled him to become familiar with the functions, organization, and procedures of the National Security Council and the Operations Coordinating Board.
[2] In this position, his functions were to seek to ensure coordinated implementation of national security policies in the programs and operations of various government departments and agencies, and to report to the President and the NSC on the effectiveness of operations coordination and implementation of national security policies.
Some of his correspondents include Nelson Rockefeller, Charles Douglas Jackson, David Sarnoff, Walter Bedell Smith, William Kintner, Hubert Humphrey, Townsend Hoopes, Robert Cutler, Robert Bowie, T. Keith Glennan, Clarence B. Randall, Lewis Strauss, Gordon Gray, and Walt Whitman Rostow.
His correspondence discussed such subjects as proposals for political warfare with the Communists, U.S. foreign policy, response to Sputnik, psychological warfare, the work of the United States Information Agency, Laos, OCB committee work, developments in Germany, the Sprague Report, and the 1960 U-2 incident.