Increased government spending can provide a temporary stimulus to demand and output but in the longer run higher levels of government spending crowd out private investment or require higher taxes that weaken growth by reducing incentives to save, invest, innovate, and work.
Anyone who says they don't enjoy the Army is mad - you can spend a week hating it and the next week it could be the best thing in the world and the best job you could ever, ever wish for. It has got so much to offer.