During the peak of the Moon Race years, NASA was nearly 10% of federal spending. DOD was 50%.
Currently NASA is 0.5% of Federal spending. DOD is 16%. This is before all the stimulus, etc. which distorts the percentages.
So, NASA was once 1/5 the DOD, now it is 1/30.
NASA would need to have twenty times its current budget to be comparable with the Moon years in gross Federal spending, but because the nature of Federal spending has changed so much, just giving NASA six times its current budget would put it back in its former relationship with DOD.
Six times the budget would allow them to do a great deal more than they do currently.