The commandant of the Marine Corps on Monday took the extraordinary step of firing two generals for not adequately protecting a giant base in southern Afghanistan that Taliban fighters stormed last year, resulting in the deaths of two Marines and the destruction of a half a dozen U.S. fighter jets. It is the first time since the Vietnam War that a general, let alone two, has been sacked for negligence after a successful enemy attack. But the assault also was unprecedented: Fifteen insurgents entered a NATO airfield and destroyed almost an entire squadron of Marine AV-8B Harrier jets, the largest...