The unofficial insignia of the MACV Studies and Observation Group ( SOG) in Vietnam.

On Jan. 16, 1964, The Joint Chiefs approve the formation of the MACV Studies and Observations Group ( SOG), a highly classified joint organization for secret operations into Laos, Cambodia, and North Vietnam. Specially selected Special Forces help tra...in teams of South Vietnamese agents for covert operations in North Vietnam, and, beginning in 1965 and 1966, will lead small teams into Laos and Cambodia.