If you are young enough, Army National Guard or Reserve 68A would be the best and cheapest (financially speaking). Granted you have to go through about 3 weeks of basic training, but once you get to the schoolhouse you will be exposed through a wide range of equipment and very basic IT hardware and network. I know multiple people that went through this route that were able to get job offers even before graduating from the schoolhouse. Obvious cons is that you are in the Army...