Petty Officer 1st Class Whitney Stettler, 365th Training Squadron Digital Voice Switching course student inspects the telephone receiver on the DMS-100 at Sheppard Air Force Base, Texas, June 13, 2017. This course provides an introduction to major areas of digital switches for identification of telephone exchange switch equipment.

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Keywords: air, america, archive, armed, army, defence, force, forces, military, navy, reportage, service, serviceman, servicemen, soldier, states, united, usa