Most are not arguing with military spending.Actually, there are several places where the government has not only created jobs, but they've created useful products that they developed and later licensed to civilians so they could make them and sell them to the public.
One such invention? Radar. Originally developed for the military, later turned over to civilians to use, and now, they are on lots of cars.
Another one? GPS. Originally developed for the military, was later released to the public domain after much discussion. Now? Almost everyone has GPS on their phones, cars, Fit Bits, etc.
Both were created and developed by the government, and later gave rise to large product and business development.