The Studies and Observations Group (aka SOG, MACSOG, and MACV-SOG) was a joint unconventional warfare task force created on 24 January 1964 by the Joint Chiefs of Staff as a subsidiary command of the Military Assistance Command, Vietnam (MACV). The unit would eventually consist primarily of personnel from the Army Special Forces, Navy SEALs, Air Force, CIA, and USMC Force Reconnaissance Units.
U.S. Air Force Pararescueman Senior Airman Matthew, from the 64th Expeditionary Rescue Squadron, Joint Base Balad, Iraq, repels from an HH-60 Pavehawk helicopter during a proficiency exercise outside of Baghdad, Iraq, April 10, 2009, in support of Operation Iraqi Freedom. (Photo by Staff Sgt. James L. Harper Jr. : U.S. Air Forces Central Public Affairs)