Army Sgt. Matthew Larsen, 7th Battalion, 158th Aviation Regiment, cleans the windows of a UH-60 Blackhawk while waiting on standby for a medical evacuation mission during Exercise Vibrant Response at Camp Atterbury, Ind., Aug. 21, 2011. Vibrant Response is the largest chemical, biological, radiological and nuclear (CBRN) response exercise designed to prepare expeditionary units focused on responding to domestic CBRN incidents. ( Air Force Photo Staff Sgt. Eric Harris)

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Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
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