There's been a guilty plea in the first case under new rules for military commissions at Guantánamo Bay.  Was it a kangaroo court or a fair hearing that will help legitimize US treatment of suspects in the war on terror?  What about the future of Guantánamo Bay?  Also, the US Navy has begun its largest demonstration of force in the Gulf since the Iraq invasion and, on Reporter's Notebook, an aide to Virginia's Democratic Senator Jim Webb charged with bringing a loaded gun into a Senate office building.