OSAN AIR BASE, Republic of Korea -- During a next generation aircrew protection (NGAP) evaluation, 51st Fighter Wing pilots and groundcrew participants tested updated chemical, biological, radiological and nuclear (CBRN) procedures for the first time by practicing step, launch and recovery of aircraft in a simulated chemical filled environment. Pacific Air Forces NGAP team members are slated to validate every installation within the major command and ultimately establish standardized counter-chemical warfare aircrew protection measures.