The Government Accountability Office recently found that the Pentagon has returned more than $80 billion in canceled funds to the U.S. Treasury since fiscal year 2013, drawing criticism from Sen. Bernie Sanders (I-VT), who says the unspent cash raises questions about defense budgets that continue to climb year after year. Sanders, a longtime critic of defense spending, has made cutting the defense budget a central focus of his 2020 presidential campaign. "We're throwing so much money at the Pentagon that...