A Marine with the Chemical, Biological Incident Response Force, in his Mission Oriented Protective Posture suit, demonstrates how to check for residual chemical, biological or nuclear agents at Yokota Air Base, Japan, April 23. The Marines of CBIRF and the Japan Ground Self Defense Forces demonstrated their collective ability to work together in a chemical, biological or nuclear event to Japan's Minister of Defense Toshimi Kitazawa and Air Force Lt. Gen. Burton M. Field, commander of the Joint Support Force and the United States Forces, Japan.