I think spending billions is a good thing, we better put money from militaire from all over the world in space to move forward as a species other than booming each other. I know this is nearly impossible but it can be. It's very important to start building live on other planets such as Mars cause when a meteor strikes earth all living will die. There are so many interesting things that we don't know anything about, traveling to other stars. We have to start somewhere. By the way, we should not spend billions but trillions, in the militaire industry there goes about two trillion around (http://www.globalissues.org/article/75/world-military-spending). We should explore our oceans as well, we don't know a lot about them and we're destroying the live there as well.