Sure. Yes, it is a more precise range than we gave last year. Last year, we started out at 7% to 8% and then we narrowed that in Q3 to 7.5% to 8% and it came in at 7.7%. And although that range was probably a safe -- a conservative range, we went up on the top end of that range. We did see -- foresee that, that could happen but we wanted to see that the play out with COVID. So that was why we did that. I think going into 2022, we didn't want to give a really wide range. We felt we'd be a little bit more transparent where we think the year is going to land. We feel comfortable that from where we exited at 7.7% for shipbuilding, we know the work we're doing, the backlog that's coming on board which isn't really going to influence 2022 that much. But the work we're doing, the serial production, the lessons learned that Mike and Chris have talked about, we feel strong about that kind of going forward. The -- COVID could have an impact on the revenue but the cost efficiency and how we're operating right now, we feel good about and we think that this is going to be a lift. We've been guiding that we're going to march our way back up and we think that's still in sight here right now. The portfolio mix, as we've said on, what we take it behind us on DCS in the mix, so that's going to slow the march back but it's still the march back up for high of -- from where we thought we'd be. So we feel good about it right now. As we work -- as we get into the year and work down the risk, we'll see that we'll realize that, right? Now specifically, what we see happening here is with more deliveries in '22, '23 and '24 than where we came from in '18, '19, '20, with the ships as we're building them with the lessons learned in serial production and there are a couple of ships in the next year or so uniquely contracted and higher incentives, I think of like DDG-125, for example, that was a modified plateau. We incorporated in ECP a unique -- uniquely how we contracted that with incentives on the schedule side of it. So there's a couple of nuances in the ships that we believe are going to be -- provide additional margin, say, than a normal ship. But we have line of sight of that right now and we feel comfortable on that outlook of 8% to 8.1%.