This is all true. Plus, the military, like aerospace, is inherently technologically conservative: it doesn't fly unless it's flown before. On the other hand, g

This is all true. Plus, the military, like aerospace, is inherently technologically conservative: it doesn't fly unless it's flown before. On the other hand, governments can throw a lot of money at an interesting topic. See John Clark's Ignition! for rocket fuels.