The Air Force is considering whether buying more F-22s is a viable, and cost-effective, alternative to developing a sixth-generation fighter as part of a larger effort to identify future air superiority capability needs, the service's top uniformed officer said Thursday. Chief of Staff Gen. Mark Welsh has in the past denied that the service was taking a serious look at buying more F-22s from Lockheed Martin. And earlier this year, Air Force Secretary Deborah Lee James called the move cost-prohibitive...