The problem with America's healthcare is not the military, foreign aid or wars. It simply is not.
The problem is the insane amount of waste in the US healthcare system. Y'all already spend much, much more per capita on healthcare than everyone else on earth by a wide margin [1], but get markedly lower returns in life expectancy [2].
Y'all need to cut the waste and middlemen out of your healthcare system, take that money and invest it into prevention (especially: fight against obesity - the US has a serious problem there costing a lot of money and causing a lot of suffering [3]), and you would get far better returns.
[1] https://en.wikipedia.org/wiki/List_of_countries_by_total_hea...
[2] https://en.wikipedia.org/wiki/List_of_countries_by_life_expe...
[3] https://en.wikipedia.org/wiki/Obesity_in_the_United_States