Assistant Secretary of Defense
Command, Control, Communications, and Intelligence
6000 Defense Pentagon
Washington, DC 20301-6000

23 June, 2000

Dr. Theodore A. Postol
Professor of Science, Technology and National Security Policy
Security Studies Program
Massachusetts Institute of Technology
292 Main Street (E38-603)
Cambridge, Massachusetts 02139

Dear Dr. Postol:

I regret any confusion surrounding the recent visit of representatives of the Defense Security Service (DSS) to you at your office. I have been asked to write to clarify the purpose of that visit.

The DSS representatives who met with you on June 21 were Industrial Security Specialists, who are usually called IS Representatives. DSS IS Representatives routinely meet with contractors and contractor employees who hold security clearances to discuss security issues, such as a potential unauthorized release of classified information. Their purpose in visiting you was to obtain information you might have about the source of possibly classified information contained in attachments to your letter dated May 11, 2000. I understand that you discussed the source of these attachments with the IS Representatives and provided information they sought; I appreciate your willingness to do so.

I want to assure you that you are not under investigation, and I regret any misunderstanding about the purpose of this visit. I hope DSS will have your cooperation as they continue to review this matter.