You left out the single payer socialized school industry. Doing away with that entitlement would dwarf the savings from all the ones you listed except SS and Medicare.
We should also reduce the military budget by issuing Letters of Marque and Reprisal. Let the private sector put up the money and make a profit from some of these conflicts.
How would that work in Grenada, or Desert Storm, Or the Iraqi invasion, or Afghanistan, or in a close to war stand off with China?