The cords covered by this specification are intended for low-voltage, audio-frequency use, where extreme flexibility is required. These cords are primarily for use with telephones, switchboards, microphones, and associated communications equipments. The cables covered by this specification are militarily unique because of requirements to survive salt water submersion, sea-water resistance (weight change of the cord), and bend at −40°C. Commercial electronic cable components are not designed to withstand these extreme conditions or sudden environmental changes, and would experience catastrophic failure.