In a rare public conversation, General Dynamics chief executive Phebe Novakovic on Wednesday predicted that defense spending will increase because of continued dangers around the world. Novakovic participated in a dialogue with David Rubenstein, co-CEO of the Carlyle Group, at the Economic Club of Washington. The conversation was wide-ranging, as Novakovic fielded Rubenstein’s questions about her father -- a Serbian immigrant who she said arrived in the United States at age 17 with $50 and no English -- and her...