Air Force Chief of Staff Gen. David Goldfein indicated this week he is "absolutely" open to the idea of incorporating more tactical nuclear weapons into the arsenal, after the Defense Science Board recommended the Air Force consider that option as modernization efforts proceed. "I do believe we're going to have discussions about munitions; I do believe we're going to have discussions about yield; I do believe we're going to have discussions about numbers of munitions required," Goldfein told reporters at...