This is an interesting factoid to ponder:
"The annual budget of the US Department of Defense is about equal to the sum total of money NASA has ever spent since its inception in 1958."
Richard Obousy, president and senior scientist for Icarus Interstellar
You have to wonder where we'd be if that spending had been inverted. At the very least, we'd probably have vast arrays of space-based telescopes sending us pictures of seasonal change on far off planets with plant life. We'd definitely have a colony of scientists permanently living on Mars.