It is common to cite the all-too-true statistic that the U.S. spends more on our military than the next seven countries combined. In 2014, we expended $610 billion compared to the $601 billion spent by China, Russia, Saudi Arabia, France, the United Kingdom, India and Germany combined. That alone should prove unsettling to Americans, especially when we realize that this figure represents 20 cents of every tax dollar collected. That's almost as much as we spend on Social Security or our combined spending on Medicare and Medicaid, and does nothing to address our rising national debt. The past chairman of the Joint Chiefs of Staff, Admiral Mike Mullen, believes that "the single greatest threat to our national security is our debt." Not ISIS or China, but our debt.