You said in your presentation that we can't be sure what the future holds. We weren't sure what the future held when the decision was made to go to the CF-18s. I've done some reading and found that very similar criticisms were levelled against the CF-18—that it was Cadillac, that it couldn't operate in the Canadian environment—and obviously we've seen that is not true.
While we're not sure what the threats are, we do know that other nations—China, and Russia—are developing a fifth-generation fighter. Why is it necessary for Canada to have a fifth-generation fighter as opposed to a fourth-generation?