For comparison the military budget in the 60s was around 9%. Today it's around 3.5%.

5% today would be more than $1tn - a government-funded industry bigger than the entire military budget, comparable to the biggest tech companies.

It made sense in the 60s because the spinoffs from the green field R&D, especially in electronics and computing, are still paying a dividend.

Today? It's hard to see a moon base paying for itself any time soon. There's plenty of science to be done on the Moon, but direct dividends for industrial development are less clear.