[bjtitus]

In 2019 the defense budget would have been #3 on your list, under only Social Security and Medicare + Medicaid. Perhaps using a pandemic year with extra outlays to avoid economic collapse is not the best way to discuss overall government spending.

In typical years the Defense spending is equal to each of the discretionary non-defense spending and "other" mandatory spending which excludes Medicare + Medicaid and Social Security. Medicare + Medicaid and Social Security spending have certainly increased the most and that seems to be inline with the increased spending on health care over the last few decades.

It's also worth noting that the non-defense categories still include defense related spending like veterans' income security, benefits, and services.