A lot of the rest is disposable. Wars have seldom been a great investment but especially in the modern age are unbelievably expensive and wasteful. Staggering as that number is, the Navy has been getting a waiver every year for a couple of decades to run with an illegally small number of carriers, the air force's fleet is getting old, the marines are cannibalizing aircraft in smaller squadrons, the army's tank is 40 years old, we don't have enough troops to meet commitments and still rotate them out of combat zones enough, etc. In terms of infrastructure, we're still sorting our way through cyberwarfare, hypersonic weapons, directed-energy weapons, and the implications of big data on submarine warfare, so it's a little hard to sort out what the good investments are anyway. And don't get me started on the VA and its funding.
Please don't misunderstand me. I'm not saying we need to fund an army which can conquer the world; I'm saying we should match our expectations with our budget. If we don't want to pay for all those things, that's one thing and I'm fine with it--but we shouldn't send troops out there unprepared to die in never-ending pointless fights with broken-down junk. If we're going to risk their lives all over the world, we owe it to them to do it for a good reason and to do it with the best gear and training possible. Paying for a small bad military and burning it up acting like you have a big good military also tends to have foreign policy problems. Figure out what you want as a country and live with it. The US can't figure it out, though.
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