Here are a couple thoughts on my part:
1) It's important to recognize that the whole "efficiency" thing isn't just about whacking whole departments, it's about cutting out the bloat
within departments. It's also about eliminating politically-motivated procurement requirements or incentives that drive costs higher, e.g. preferences for minority- or woman- or veteran-owned vendors. I would argue that
anything DEI-related (like
this or
this or
this or
this, at salaries nearing $200k/year(!)) needs to go. At best, it's a waste of money IMO, and at worst, it actively destroys productivity and morale. The lions share of anything social-media or PR-related can likely go as well. Use-it-or-lose-it budgets need to go away. Procurement needs to be streamlined. How many hundreds of billions of dollars were wasted or defrauded during the pandemic?
2) What departments or major spending should go? Definitely Education is a valid target. You're going to have to work
really hard to convince me of the
net benefit of the federal DoE. They take tax dollars in, dole taxpayer dollars out, and employ a bunch of people in the process. Taxpayer-subsidized student loans are
definitely on the menu. They subsidize
college attendance, not graduation or marketable skills or knowledge, and have contributed to the tremendous inflation in college costs over the past 50 years. Housing can go, as can much of Transportation. The fact that my town of 30,000 residents is waiting for a federal handout to widen a local road is just stupid. The management of roads needs to be pushed to more local levels of government. Department of Labor, too.
3) The military is a bit of a mess. Too much brass, too many pet projects, too much bureaucracy in procurement. Too many cooks in the kitchen, too many pie-in-the-sky dreams driving unreasonable requirements. A friend who worked on a particular fighter jet told me that there was a senator who wanted his rather petite granddaughter to be able to fly a new fighter design. The cost to re-engineer just one of the fighter's systems to accommodate her physiology was in the eight figures. The process of procuring an existing, off-the-shelf product is stupidly complex--one part of the organization says they want it, another has to write up requirements saying "we need a device that does X, Y, and Z," a third department then takes those requirements and then looks around to see if such a widget exists, a fourth department controls the money, and a fifth has to do the approvals, and nobody wants to stick their neck out.
All that said, US military spending is near its
lowest level, as a share of GDP, in nearly a century. The only time our military spending has been lower (as a share of GDP) was in the few years leading up to 9/11.