Private military contractors have spotted an opportunity as America’s longest war grinds on. Here’s a crazy idea floating around Washington these days, outlandish even by today’s outlandish standards: The United States should hire a mercenary army to “fix” Afghanistan, a country where we’ve been at war since 2001, spending billions along the way. The big idea here is that they could extricate U.S. soldiers from this quagmire, and somehow solve it