A few larger ICBMs like the LGM-118A ‘Peacekeeper’, LGM-25C ‘Titan II’, and the R-36M (NATO reporting name SS-20 ‘Satan’) can loft a few hundred kilograms of payload into a low energy escape orbit with the addition of a kick motor like an Agena or Inertial Upper Stage (IUS). There is hardly any reason to manufacture a reason to “use up” ICBMs, as they’re already being used as surplus space launch vehicles. The Titan II was used for years, repurposed as the Titan 23D and 23G, also serving as the family design template for the Titan II Gemini Launch Vehicle, and Titan III and IV space launch vehicles. The Peacekeeper is in use today as the OSP-2 Minotaur IV space launch vehicle and sounding rocket (with the addition of Orion 38 and Star 48 kick motors in place of the operational Post-Boost Vehicle), and will be used for the Minotaur V (with an additional Star 37) for the Lunar Atmosphere and Dust Environment Explorer (LAD-EE) mission. The R-36M is in use as the Dnepr SLV.
As there is very little existing atmosphere on Mars and no magnetosphere, freon would break down into constituents, with free hydrogen and lighter compounds escaping into a wide halo around the planet while the heavier hydrocarbons and the reactive chlorine and fluorine compounds reacting condensing. This would not make Mars habitable even if we could send the almost unimaginable amount of mass to Mars. There is no viable means to make the surface of Mars habitable with extant technology, or that such a system could be sustained indefinitely. Nor is there any particular need to do so; if we were capable of supporting the kind of energy and infrastructure to alter the surface of Mars, we would be better off constructing orbiting habitats out of space-borne materials like water ice and silicates, which are a much more efficient use of space and energy.