Take all government spend out of the GDP. It is not GDP. as it is not a product.
Not true. Highways are important capital assets. They are constructed and maintained at unnecessarily high cost.
The GPS constellation costs about 1.5-2.0 billion a year to maintain, a tiny fraction of government spending, amounting to about 1.6ยข per American citizen per day, and returns vastly more value.
A very large fraction of government spending is inefficient, and even counterproductive. Student loans, for instance, probably cause more problems than they solve.