Social security is paying back what people have put into it, nobody alive today is collecting from it without having paid in to it their entire working life. It seems misleading to call this an expenditure in the sense that military spending is.

There is also a distinct difference between healthcare spending and healthcare being received. The US spends a lot on “healthcare” that is actually insane insurance profiteering or useless administrative costs. There’s a reason the US has the highest expenditure per person in the world, but the worst health outcomes among any industrialized nation (and worse than some developing nations if you’re a minority).