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Staff Sgt. Dawson Parker, 364th Training Squadron electrical and environmental systems apprentice course instructor, directs his students, Airmen Trenton Jackson and Tyler Bethone, on how to replace the bleed air check valve at Sheppard Air Force base, Texas. The valve prevents shutdown of the environmental control system, which if shut down would result in loss of the anti-G system that prevents the pilot from passing out due to the severe effects of G-force. (U.S. Air Force photo by Senior Airman Robert L. McIlrath)

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Photo by: Senior Airman Robert L. McIlrath |  VIRIN: 170609-F-ZC626-0048.JPG