U.S. Air Force Airman 1st Class Arthur Bradshaw, 35th Aerospace Medicine Squadron bioenvironmental engineering technician, pours Colilert-18 into a water sample at Misawa Air Base, Japan, April 17, 2012. Colilert-18 is a chemical that rapidly speeds up the growth of bacteria and other pathogens, which makes it easier for technicians to examine the base water. (U.S. Air Force photo by Airman Kenna Jackson/Released)
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