The idea that the government does any better with efficiency when it comes to the military (as opposed to any other function)is silly. Yes the military is a legitimate function of government, but I assure you there’s bureaucracy/fat there.
The DoD is as good as it gets in government spending. Yes, there is waste - but NO government program will ever be run without waste. Nor is there any way to identify the waste. Is the spending on UAVs a good investment in the future, or a waste of money? How many men do we need in the Army, and what spending will keep those levels?
Those are judgment calls, and no one has perfect judgment. Nor can we use competition & have multiple militaries competing with each other.
I worked at 12th AF before I retired. I thought it totally useless, but I doubt everyone else agrees.
Also, the military is almost trivial in government spending. If you totally eliminated the military, our deficit would still be higher than it was under GWB! The REAL money lies in entitlements. Without cutting those, no significant cuts will happen.