The National Interest reports on the U.S. Navy's best weapons. Most are what you might imagine, the exception is their new combat laser. It is reported to cost $0.69 per shot to fire, replacing a missile system that cost roughly $99,000 for each missile.
This is truly the stuff of science fiction becoming the stuff of reality. If it proves to be as good as claimed, we need lots of them fast. Hat tip to RealClearDefense for the link.