https://quincyinst.org/2022/02/03/what-a-waste-778-billion-for-the-pentagon-and-still-counting/
Cutting waste and unnecessary weapons systems at the Pentagon is where to start with government cuts. They've failed their 7th audit in a row.
Bernie Sanders proposed an amendment making a 10% reduction to the Pentagon's budget. A handful of Democratic Senators supported it. I think Rand Paul was the only Republican to do so.
If Elon Musk is serious about cutting wasteful spending, he can start with the Pentagon.