Armor or concrete?

After careful consideration, I think I have an idea for a topic that would be a valuable addition to our class discussion thus far. I don't want to put too much flash into this post in case the idea isn't what we're actually supposed to be doing, but I would like to do some research into security in the United States in the post 9/11 world. One of the things that stuck out to me was the decision in Washington to cut funding on the war on terror to pay for a concrete barrier along the Mexican border and I think that a paper that examined the war on terror and how it relates to national security would be an interesting topic.