Certainly, interoperability is in many respects what NATO is all about. It allows nations to bring what they can to an operation. So it goes right from the basics of NATO having standard agreements as to standardization of the type of fuel we might use in our airplanes or to the type of ammunition, on up through to, within our headquarters, how do we talk, how do we plan, and having a common approach to, again, having a higher level platform at the pol-mil level, where we can come together and collectively advance approaches—so agreeing on the framework for a future NATO mission.
But throughout all of that, it's absolutely essential that you have that ability to plug and play as a group of allies—not only as a group of allies, but increasingly, the partners are able to also plug into that. So it's a framework to plug and play at the political-military level, certainly, to plug in at that operational level within the headquarters and those staffs.
Then there are those basic standards of knowing and understanding what the NATO standard would be for certain things where you can plug in at the tactical level.