U.S. Air Force Staff Sgt. Estrella Martinez, 18th Wing Public Affairs broadcaster, checks a strip of chemically reactive paper for evidence of harmful substances following a simulated chemical attack on Kadena Air Base, Japan, April 23, 2015. The paper used during post-attack reconnaissance sweeps changes colors when exposed to different chemicals. By observing the colors on the paper, or lack thereof, trained personnel are able to determine what chemicals are present in the environment. (U.S. Air Force photo by Airman 1st Class Zade C. Vadnais)
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