Spc. Jonathan Coates, of Birmingham, Ala., Spc. Zackary Chaffin, of Huntsville, Ala., and Krystal Lloyd, also from Birmingham, Ala., guardsmen from 208th Chemical Company, 151st Chemical Battalion, 31st Chemical Brigade out of Springville, Ala., prepare to enter a building to conduct site characterization at Mascatatuck Urban Training Complex, Ind., Aug. 8. The chemical, biological, radiological and nuclear specialists bring CBRN detection equipment and causality extraction equipment to the building during Vibrant Response 13. Vibrant Response is a major field training exercise conducted by U.S. Northern Command and led by U.S. Army North.