Once thought dead and buried on the battlefields of Iraq, a muscular and militaristic "neoconservative" approach to US foreign policy is making a comeback. For most of the last decade, the "neocons" -- personified by former vice president Dick Cheney and ex-Pentagon boss Donald Rumsfeld -- have been out of office and out of fashion. But the 2016 presidential race has seen Republican candidates embrace ideas and advisors once ostracized for the catastrophes and hubris of George W. Bush's "preemptive war" in Iraq. During last week's Republican presidential debates, 17 candidates tripped over themselves to declare President Barack Obama weak...