ARDENT SENTRY An unidentified member of the Marine Corps Chemical Biological Incident Force casualty extraction team repels down a four-story building with a simulated victim during the Exercise Ardent Sentry '07, May 14 2007. As part of the exercise, troops are responding to a simulated nuclear detonation in Indiana. SHARE IMAGE: Download Image: Full Size (0.04 MB) Photo By: VIRIN: 964382-L-CCQ43-133.jpg Photo Gallery