This is a great looking National Security Agency challenge coin. Coin has reeded edges and is about 1 9/16" in diameter. Coin is contained in an acrylic snap tight holder and displayed in an attractive blue velvet presentation box which will make this a very impressive gift or presentation.

The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence. The NSA is responsible for global monitoring, collection, and processing of information and data for foreign intelligence and counterintelligence  purposes, specializing in a discipline known as signals intelligence. The NSA is also tasked with the protection  of U.S. communications networks and information systems. The NSA relies on a variety of measures to accomplish its mission, the majority of which are clandestine.