05 March 2015 20th Chemical, Biological, Radiological, Nuclear, Explosives Participates in Key Resolve Exercise YONGSAN GARRISON, South Korea -- The U.S. Defense Department's only command that combats global chemical, biological, radiological, nuclear and explosive threats is participating Key Resolve in South Korea March 2 - 13.Soldiers from the Aberdeen Proving Ground, Maryland-based 20th CBRNE Command...