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July 9, 2019

A member of the Sandia National Laboratories tests low friction coatings applied to concrete block in New Mexico, April 22, 2014. The work conducted at Sandia was a precursor to the current collaboration between the Diplomatic Security Service Physical Security R&D program and Johns Hopkins University Applied Physics Lab. (Sandia National Laboratories photo)

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U.S. Department of State

The Lessons of 1989: Freedom and Our Future