DFU
Buffer solution is extracted from a conical tube to retrieve any particles that are in the filter paper of a dry filter unit during Operational Readiness Exercise Beverly Midnight 13-03 at Osan Air Base, Republic of Korea, Aug. 9, 2013. DFUs are checked every 12 hours, depending on the mission, where emergency management and bioenvironmental Airmen collect and change the filter. (U.S. Air Force photo/Senior Airman Kristina Overton)
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