U.S. Army Sgt. Kirk Marra, Army Forces Battalion, shows the before and after glasses of water and explains the water purification process of the Pre-Positioned Expeditionary Assistance Kit system to Dr. Rebecca B. Chavez, the deputy assistant Secretary of Defense for Western Hemisphere Affairs, during a command tour of Joint Task Force-Bravo at Soto Cano Air Base, Honduras, Aug. 28, 2014. Photo by Martin Chahin U.S. Army Sgt. Kirk Marra, Army Forces Battalion, shows the before and after glasses of water and explains the water purification process of the Pre-Positioned Expeditionary Assistance Kit system to Dr. Rebecca B. Chavez, the deputy assistant Secretary of Defense for Western Hemisphere Affairs, during a command tour of Joint Task Force-Bravo at Soto Cano Air Base, Honduras, Aug. 28, 2014. Photo by Martin Chahin SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 537223-B-ARD37-309.jpg Photo Gallery