Tech. Sgt. Robert Knight, 28th Maintenance Squadron aircrew egress system technician, evaluates an environmental sensor during a quality check on a training Advanced Concept Ejection Seat II in the egress shop on Ellsworth Air Force Base, S.D., June 12, 2012. The environmental sensor is responsible for communicating with the computer systems in the aircraft to ensure that airmen can eject properly and safely if required to do so. There are four ACES II systems installed in every B-1 bomber.
Airman 1st Class Kate Thornton
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