The Air Force does not have the resources or the need to buy the F-35B, the short-takeoff-and-vertical-landing version of the Joint Strike Fighter developed for the Marine Corps, Air Force Chief of Staff Gen. Norton Schwartz said today. In past years, Air Force leaders have sometimes said that the service -- which is committed to purchasing the F-35A conventional variant -- might benefit from the acquisition of a few F-35Bs for certain missions. During a panel discussion today at the...