It's our belief that the best-value model we're putting in place on the F-35 is a new model and it is quite different from the offset or IRB model of the past.
The IRB model of the past is contingent on contract award. There's a period of performance that the contractor has to implement industrial benefits. Those benefits are not often direct to the airplane or not direct to even the aerospace industry, and they're short-lived: when the obligation is fulfilled, it's done.
In this case, it's early, and it continues on beyond procurement of the airplanes as long as we're building F-35s, so I think it's quite different. It's a different risk equation, because it's not guaranteed up front. But there's a huge reward to it because it's much longer term and much higher value.