McKinley Climatic Laboratory team member Craig Marshall checks the vacuum on a refrigeration unit used in the facility at Eglin Air Force Base, Florida, May 17, 2022. 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 Bruce Hoffman)
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