Were I POTUS or SECDEF. I would demand a 10% cut yearly of the 5-Sided Puzzle Palace. Not Defense, just within the walls of the Pentagon. (Now if you want to send those folks/slots out to line units (as in beef up or make more), I'd be good with that. There are far to many high ranking officers (and enlisted) running around the Pentagon. I'd close-up all the offices in one entire side of that building.
Same with the rest of the .gov. Get rid of DOE (both of them), along with a few others, a phase out, over say over 4 years. While the rest of the .gov has to reduce by 10% each year. And if you can't find 10% to cut without cutting those that, you know, actually deal with the US taxpayer (like Park Rangers, and VA Docs and Nurses) then you're fired and and I find a new Cabinet member to do the job. (BTW, the VA gets put under the DOD. Once you join the DOD is "responsible" for you, until you die, and then they're responsible for your grave.)