US Air Force (USAF) 1ST Lieutenant (1LT) James Bridgman, 18th Security Forces (SF), observes Fireman, Mitsuo Yamaguchi, 18th Civil Engineer Squadron (CES), as he checks his safety equipment before entering a simulated contaminated area Kadena Air Base (AB), Japan (JPN), while the base is conducting a Full Spectrum Threat Response Exercise (FSTR) to test emergency personnel's response procedures