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The C-5 Air Conditioning and Pressurization Systems Trainer, panel number 2, displays airflow to valves Feb. 20, 2019, at the 373rd Training Squadron, Detachment 3, on Dover Air Force Base, Del. The AC & PST allows students to see and hear components move when switches are moved on the flight engineer’s control panel. (U.S. Air Force photo by Roland Balik)
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