A weapon of mass destruction Civil Support Team (WMD-CST or CST) supports civil authorities in the event of the use, or threatened use, of a weapon of mass destruction. CSTs are federally funded units established under Presidential Decision Directive 39. There are 57 National Guard Teams and one Army Reserve full-time team: one in every U.S. state, Washington, D.C., Puerto Rico, Germany, Guam, and the US Virgin Islands with an additional team each in California, Florida, and New York.[1][2]