January 1968 Orders for 441st MI Det members to be assigned to MAC-SOG in Vietnam:
(Called the Studies and Observations Group, this top secret military special operations command under Colonel John Singlaub carried out CIA military missions in third countries including Cambodia, Laos, and North Vietnam. Excellent books on the subject include SOG, The Secret Wars of America's Commandos in Vietnam by John L. Plaster, Simon & Schuster, New York, 1997 (ISBN 0-684-81105-7) and The Secret War Against Hanoi by Richard H. Shultz, Jr., HarperCollins, New York, 1999 (ISBN 0-06-019454-5). The orders below are interesting as a security violation since a MACSOG "connection" is cited within. 441st members carried out intelligence duties in support of MAC-SOG. Most of these 441st members were further assigned to Command and Control Detachment (C&C) in DaNang (later C&C North). Six of these 441st members worked with members of the 5th Special Forces Group (Airborne) who were assigned to Ops 35 of MAC-SOG under the command of Colonel Johnson. SP6 Charles Owen and SSG Tadashi Sasahara were further assigned to the Forward Operational Base (FOB) at Khe Sanh and survived the entire North Vietnamese siege of the base in 1968.