JP-5, JP-8, and DFM are all different types of jet fuel used by different branches of the military. JP-5 is a high flash point kerosene-based fuel used by the Navy and Coast Guard, while JP-8 is a lower flash point kerosene-based fuel used by the Air Force and Army. DFM, or Diesel Fuel Marine, is a variant of JP-8 used by the Marine Corps. More @Wikipedia
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