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Hanscom looks to modernize NCR defense system
A visual warning system, part of the current Enhanced Regional Situational Awareness, or ERSA system, monitors situational awareness in the national capital region. A program management office at Hanscom Air Force Base, Mass., recently released a request for information to modernize the ERSA system. (Courtesy photo)

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Photo by: Jessica Casserly |  VIRIN: 150408-F-FP939-002.JPG