You could cut the military budget 30-40% and never sacrifice a thing. As a matter of fact, wed have more and better hardware. How?
1. Stop playing politics with the budget. Boeing gets a five year contract for 60 planes, but the funding is only one year at a time. So, instead of building a dedicated production line each plane is hand built. If its a multi-year procurement, fund the whole thing at once so they can set up automated lines and get better long-term pricing.
2. Stop playing politics with the contracts. The small business and minority set asides and gimmes for political supporters. Theyre hideously inefficient and expensive.
3. Get rid of the Greenies. The contracts all have ludicrous green requirements that run the cost through the roof.
4. Stop buying things the military doesnt want and cant use just because the plant is in some Senators district.
Nothing is more expensive than NOT being ready to go to war. Nobody gets attacked because theyre too strong.
So how would you cut military spending really? How big a Navy would you have in terms of ships, carrier groups, etc. What would your staffing levels be since personnel costs make up 26% of the budget?
Bottomline: There is no way you can cut DOD by 30% to 40% without sacrificing a thing.