Staff Sgt. Scot Havir (left) of Glendale, Ariz., and Sgt. Larry Worthen of Phoenix, both with the Arizona National Guard's 91st Weapons of Mass Destruction - Civil Support Team, prepare to evaluate a simulated chemical spill, Oct. 16, in support of Top Official (TOPOFF) 4. TOPOFF is a national level, multi-agency, multi-jurisdictional, "real- time," limited-notice WMD response exercise, designed to better prepare senior government officials to effectively respond to an actual terrorist attack involving WMD. Arizona National Guard's specialized WMD unit participates in TOPOFF 61951

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