ROBINS AIR FORCE BASE, GA - MSgt. David Rodriguez, superintendent of the 778th Civil Engineer Squadron, demonstrates how to use a portable water purifier. Rodriguez said these devices comes in handy when the only water available is from a mud puddle, lake or stream. There are several portable water filters on the market which reportedly remove all pathogens and viruses from water that are poured through the devices. (U.S. Air Force photo by Kisha Johnson)