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http://mpddigital.us/It's important not to confuse coaxial cables made to current Military Specifications (M17/75 or Mil Spec) with those now simply labeled as "RG". In order to regulate and develop specifications for coaxial cable used during WWII the Government adopted a series of cable designations taken from the Radio Guide and know as "RG" to define coaxial cable type, size and construction. Unlike current Mil Spec coax which must meet tough specific criteria, RG coax made today meets only the standards of the company producing it.