US Air Force Technical Sergeant Matt Diyanii is detained by a defender after breaking through his camp line. The detainment took place during an opposing forces (OPFOR) attack scenario. TSGT Diyanii is part of the 171st Security Forces Squadron, Pennsylvania Air National Guard, Pittsburgh, Pennsylvania. During the two-week class, operated by the 421st Ground Combat Readiness Squadron, Fort Dix, New Jersey, students are trained in doctrine, tactics, and customs of hostile countries. The OPFOR team acts as a training aid to the Phoenix Readiness Course, enabling realistic training scenarios in a variety of situations