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Test and Experimentation Command Commanders ATEC Challenge Coin #121F Special Operations Group United States Navy USN USSUnited States Army Test and Experimentation Command Experimentation Center Commanders Challenge Coin #121F Measures 1 3 4" inches Engraved MG Adams This coin came in with a large collection from a estate sale in Pennsylvania. Lieutenant General Ron Emerson Adams began his active military service as a platoon leader with the 11th Armored Cavalry Regiment. He went on to command cavalry units during two combat tours in Vietnam and during service with the