Dr. Christine Altendorf, USACE Headquarters Chief of Environmental Division, listens to John Bishop, a security engineer, as he explains a new system designed to support the metering of utilities on Fort Huachuca in Sierra Vista, Ariz., Aug. 29. Altendorf's visit to the post was part of a trip to see some of the District's sustainability initiatives and how they work under real-world conditions.

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Photo by: Daniel J. Calderon |  VIRIN: 120829-A-TV651-069.JPG