Elite Warriors: Vietnam - BEFORE THERE WAS Delta Force, THERE WAS SOGThe Vietnam War’s most highly classified special operations were performed by the Studies and Observations Group. Consisting primarily of U.S. Army Special Forces “Green Berets, ” SOG warriors fought top secret missions deep behind enemy lines.Infiltrate deep into Laos with your Green Beret and Montgnard teammates, hunted by trackers and bloodhounds, outnumbered at times 100-to-1.