THROUGH THE SMOKE U.S. Marines conduct urban search and rescue after a simulated chemical, biological, radiological, nuclear, and high-yield explosive incident at Muscatatuck Urban Training Center, Ind., during Exercise Vibrant Response, Nov. 9, 2009. Vibrant Response is a field training exercise in which Department of Defense forces assist federal, state, local, and tribal partners in saving lives, preventing further injury, and providing temporary critical support to enable community recovery. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 792845-X-BRW59-806.jpg Photo Gallery