You can't be forced to actually work with the government. So if the governmeny makes it too much of a PITA, no one will bid or they will make the contract costs incredibly high.
Actually, yeah you can. Happened in WW2. People can be drafted and stop lossed. Entire factories were taken over, wages were frozen, and product shortages happened due to military need. If people can't make a profit building military units perhaps it's time the military starts building it's own skills again.
That will never happen in a post-Vietnam era, outside of the US fighting for it's existence.