It would cost the US less as a society to have universal healthcare rather than the horror we have now.
Most US government spending, $10 trillion (federal + state + local), goes to social welfare programs and entitlements.
That $10 trillion is larger than the entire economies of Japan + Germany combined.
The US spends more on healthcare than any other nation, by far. It hasn't given up anything.
The poorest 1/4 of the US population gets entirely free healthcare, and it's the most expensive free healthcare that you'll find anywhere on the planet. Another quarter of the US population receives directly subsidized healthcare.
Over-spending on the US military is a $200-$250 billion problem. The US spends $4+ trillion on healthcare every year.
Practically every full-time employee (32 hours or more per week) in the US gets paid time off. Your average retail store employee - working at CVS, Walgreens, Amazon, Walmart, Target, etc - earning ~$13-$17 / hour typically accrues 10-14 days of PTO per year (one can certainly argue it should be more; pretending it doesn't exist, or using "by law" to devalue its existence, is absurd).
I doubt it. When the budget is billions of largely unaudited dollars and a senate that will approve any budget increases what reason is there to save money? I can’t imagine the nepotism found in military contracts are saving the military money when these companies gaining the contracts want as much tax-payer money as possible.