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Team members at the McKinley Climatic Laboratory at Eglin Air Force Base, Florida, use machines to create snow in the MCL Main Chamber to prepare for environmental testing. Those at the MCL recently celebrated the 75th anniversary of the facility. The first tests at the MCL occurred in May 1947. The MCL is operated by the 717th Test Squadron, 804th Test Group, Arnold Engineering Development Complex. (U.S. Air Force photo by William Higdon)
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