Military Assistance Command, Vietnam – Studies and Observations Group (MACV-SOG) was established in January 1964 to conduct unconventional warfare operations. These included reconnoitering and disrupting North Vietnamese activities in Laos and Cambodia. Given the sensitive nature of MACV-SOG’s work, its missions were classified. John Plaster served three years with MACV-SOG and tells the unit’s story in “SOG: The Secret Wars of America's Commandos in Vietnam.”