While it may seem that nearly every type of industry today is making use of 3D printing, this applies to the US military also. And while they may employ creativity while making new parts just like everyone else, most US government offices and aspects of the military have detailed plans and long-range goals for how they plan to use the technology wisely.
The United States Marine Corps has been very active in using 3D printing, from creating drones to considering ways that the technology can be used in combat. They have also continued to dream up ways that 3D printing can be made more accessible for their forces. With X-Fab (expeditionary fabrication), they have now created a portable lab that can move with maintenance units for Marine battalions.