Aircraft electrical and environmental system technicians with the 509th and 131st Aircraft Maintenance Squadrons set up a cabin pressure tester cart at Whiteman Air Force Base, Mo., July 27, 2017. Cabin pressurization creates a safe and comfortable environment for the pilots when they fly missions at altitudes as high as 50,000 feet. (U.S. Air Force photo/Staff Sgt. Danielle Quilla)
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