JOINT BASE LANGLEY-EUSTIS, Va. (Jan. 22, 2021) Harold Richardson, a geographic information systems technician and crisis action team member assigned to Joint Task Force Civil Support, constructs a simulated plume model during Exercise Sudden Response 21. Military units comprising the Defense CBRN Response Force (DCRF) participated in Exercise Sudden Response January 21-27, 2021 near Joint Base Lewis McChord, Wa., Camp Rilea, Ore., and at Joint Base Langley-Eustis, Va. Teams from Task Force (TF) Aviation, TF Logistics, TF Medical and TF Operations, rehearsed force and equipment employment, life-saving operations and web-based collaborative tools to ensure their ability to execute the Defense Support of Civil Authority (DSCA) mission they assumed June 1, 2020. The DCRF consists of about 5,200 personnel from military units located throughout the nation who come together to help fellow Americans in the event of a catastrophic crisis response. (U.S. Navy photo by Mass Communication Specialist 2nd Class Michael H. Lehman)