You are correct and DOD contracts also have been coopted by the political system to fill other needs like funneling money to senators' districts.

Those jobs protects aren't necessarily wasteful in that they stimulate the economy and cutting them would have serious impacts for those states. The essential question is, could that subsidy to a state have more impact. For instance, rather than building tanks the military does not want or need, fund and hire more teachers, build things the military actually does need like ships, fund startups, fund science projects in those states, etc...