2nd Central Nuclear Biological Chemical Weapon Defense Unit makes his way through a smoke filled room inside the fire training tower aboard Marine Corps Air Station Iwakuni, Japan, Nov. 7, 2014. The 102nd Central NBC Weapon Defense Unit, Marine Aircraft Group 12, and the MCAS Iwakuni Fire Station collaborated to conduct interoperability training while executing Chemical Biological Radiological Nuclear and Hazardous Material Emergency Response Operations. - 2nd Central Nuclear Biological Chemical Weapon Defense Unit makes his way through a smoke filled room inside the fire training tower aboard Marine Corps Air Station Iwakuni, Japan, Nov. 7, 2014. The 102nd Central NBC Weapon Defense Unit, Marine Aircraft Group 12, and the MCAS Iwakuni Fire Station collaborated to conduct interoperability training while executing Chemical Biological Radiological Nuclear and Hazardous Material Emergency Response Operations.