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Dear Mr. Streifer,
Thank you for posting your request on History Hub!
DASA probably means Deputy Assistant Secretary of the Army. Without knowing which specific Deputy Assistant Secretary the message was sent from or what office it was sent to, the message may have been approved or a copy sent to the Office of the Secretary of the Department of the Army. Therefore, we searched the National Archives Catalog and located series titled Subject Files and an Index, 1966-1970; National Security Council Agendas, 1964-1979; Summaries of Significant Actions, 1965-1969; Top Secret Subject Files and Index, 1967-1968; Classified Subject Files and Index, 1967-1968; and Security Classified Minutes of Army Policy Council Meetings, 1966-1973 in the Records of the Records of the Office of the Secretary of the Army (Record Group 335). Some of these still may be classified.
The staff of the National Archives at College Park - Textual Reference (RDT2) will be pleased to make the finding aids to these records available to you or your representative in the Textual Research Room located 8601 Adelphi Road, College Park, MD, near the University of Maryland--College Park campus. The Textual Research Room (Room 2000) hours are 8:45 a.m. to 5:45 p.m. Monday through Friday, except legal holidays. The RDT2 consultation room hours are 8:45 a.m. to 4:00 p.m., Monday through Friday, except legal holidays. No appointment is necessary. Prior to your visit, please consult College Park websites at https://www.archives.gov/dc-metro/college-park/, https://www.archives.gov/dc-metro/self-service-copying.html, and https://www.archives.gov/research/start/getting-started.pdf.
We hope this is helpful. Best of luck with your research!