Sure. I would say, basically, two broad things. We are facing a broader array of missile threats than we did 20 years ago. Ballistic missiles are one part of that, but advanced cruise missiles and hypersonics are additional evolving components of that. To say there's a specific need to focus on just one type of those, I think, is an incomplete answer at best, because there's a range of possible scenarios that we need to improve our defences against.
With regard to the integrated component of that, the way to think about it, as we're seeing play out in some cases in Ukraine right now, is that the best defence is to have a layered, integrated set of systems that can defend against a range of incoming missiles rather than having individual, disaggregated systems that have to look, identify and basically assess an individual type of incoming missile and then make a determination about whether or not it's something you want to be able to, effectively, shoot down. A system that can deal with a broad array of different missile threats in a way that is cohesive and integrated, that doesn't have to rely on distinct sets of pieces of technology being cobbled together but was designed to be integrated from the beginning, I think, would be an ideal scenario.