I'm a big fan of really reducing our military in size/budget but I think this is an easy one to pick on but once you start peeling back layers it gets more and more difficult. Personally I'd rather phase out programs like Social Security that I'll never see a dime of yet have to pay for, and/or combine multiple programs into a UBI of sorts. But then once you start talking about these things (like hey let's get rid of the TSA or the military) you start to realize... they are jobs programs and what are you going to do with so many people out of work? Will they start tech companies? Beats me. At least the military enforces the Petrodollar system which benefits you (assuming you're an American) so it's not like it's just all sunk cost or something.

Outside of the general "no" from some people w.r.t universal health care I think that's another reason the federal government has been so unproductive in just making it happen. You going to fire all of those people and completely re-tool the economy? It's not that easy.

But also the military while a large portion of the budget isn't that crazy relative to what we're doing. Should we pull out of Germany, Japan, and South Korea? Only sell weapons? Should we pull forces out of the Pacific and let China conquer Taiwan (or unify depending on your perspective)? I think it starts to get very complicated, very quickly.

-edit-

A quick tangent unrelated to your comment is that we've been trained to assume that all government spending is "waste" which is kind of irritating. Items like the infrastructure bill (or at least components of it at a minimum) can be viewed as investments with ROI instead.