None whatsoever. Where we can learn, clearly, is the theatre in which the Norwegians began to operate. Norway was one of the very first countries to go with the F-35. Richard can correct me, but I believe it was either block I or block II. That was acquired by the Norwegians, and they have had complete success. There have been no reports of any difficulties in terms of Arctic conditions. They had to do certain modifications in terms of running on ice-covered runways and technical aspects. These are all issues that can be shared with us.
Other countries, of course, have looked at it in terms of gathering the F-35. The Danes took about two years to decide. They actually weren't going to go for a fixed-wing fighter. After the Ukrainian war started in 2014, they decided that, yes, they needed to go to fixed-wing. They took about a one-year or one-year-and-a-half process to decide on the F-35s. They will be preparing to be able to operate off Greenland at a future date.
Of course, the most recent of our northern friends that went for the F-35s are the Finns. Once again, it took about two or two and a half years for them to decide. They've co-operated closely with the Norwegians to ensure that any of the difficulties of operating in cold environments, of being able to ensure that you can take off and land on ice-covered runways, are taken care of. The expectation, and what all three of our friends and allies tell us, is that there's absolutely no problem that is not solvable.