Where is that wasteful government spending?

In early September 2016, Donald Trump announced his plan for a vast expansion of the U.S. military, including 90,000 new soldiers for the Army, nearly 75 new ships for the Navy and dozens of new fighter aircraft for the Air Force. Although the cost of this increase would be substantial — about $90 billion per year — it would be covered, the GOP presidential candidate said, by cutting wasteful government spending.

But where, exactly, is the waste? In fiscal 2015, the federal government engaged in $1.1 trillion of discretionary spending, but relatively small amounts went for things like educatio...