Airman 1st Class Alyxandria Castillo, 22nd Maintenance Squadron section apprentice, checks a seal inside a KC-135 Stratotanker Nov. 1, 2013, at McConnell Air Force Base, Kan. The seal makes sure air stays in the aircraft during cabin pressurization. Cabin pressurization becomes necessary at high altitudes to protect aircrew from a number of problems such as hypoxia and altitude sickness. (U.S. Air Force photo/Senior Airman Maurice A. Hodges)
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