Code-named the Studies and Observations Group, SOG was the most secret elite U.S. military unit to serve in the Vietnam War-its very existence denied by the government. Composed entirely of volunteers from such ace fighting units as the Army Green Berets, Air Force Air Commandos, and Navy SEALs, SOG took on the most dangerous covert assignments, in the deadliest and most forbidding theaters of operation. John L. Plaster, a three-tour SOG veteran, shares the gripping account of SOG's stunning operations behind enemy lines-penetrating heavily- defended North Vietnamese military facilities, holding off mass enemy attacks, and launching daring missions to rescue downed U.S. pilots. From sabotage to espionage to hand-to-hand combat, these are some of the most extraordinary true stories of honor and heroism in the history of the U.S. military.