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Team tests concept demonstrator
The test team monitors the HEF during the C-17 portion of the Hybrid Electric Flightline Cart Technology Pathfinder tests. The HEF was a concept demonstrator built to explore an all-electric or hybrid electrical power supply for use by flightline maintainers. Some possible advantages are lower noise, less emissions and less maintenance than the diesel generators currently in use. (U.S. Air Force photo by Christopher Ball)

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Photo by: Christopher Ball |  VIRIN: 170214-F-IS743-003.JPG