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   Materials, Campaigns, CDE HD, Other mods
   Military, Drones, Missiles, Scientific, Industrial, Consumer, Stations
   Propulsion
   Combustion Rockets, Nuclear Rockets, Magnetoplasmadynamic, Resistojets,
   Internal Tanks, External/Drop Tanks, Refuelers
  Power generation
   RTGs, Reactors, Radiators
  Weaponry
   Conventional Guns, Railguns, Coilguns, Lasers, Carriers/Launchers,
   Flares, Flak bombs, Nuclear bombs, High-Explosive bombs
  Other modules
  

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Drones: Have no crew, may or may not be armed, main purpose is NOT ramming attacks.
Missiles: No guns, no crew, intended to ram into target, usually loaded with an explosive.
Military: Crewed ships with weaponry. If it doesn't carry weapons, it's not military.
Industrial: Crewed unarmed ships, intended for hauling, or other industrial purposes. Unarmed refuelling ships belong here.
Scientific: Test targets, prototypes, attempts at building the biggest or smallest "X", and other things that aren't intended for battle.
Consumer: Crewed unarmed shuttles, personal craft, race-rockets, and other small civilian vessels.
Stations: Crewed, but no engines. May be military, industrial, or civilian in nature. Usually found in stable orbits.