 No, they were tractors that were converted into obstacle-removing dozers. And if you go through and you look at Caterpillar, for instance, the tractor company's history, you can see a lot of information on how involved they were in the war and the different type of tractors that were converted and used. I was recently in Normandy, and I was actually searching for a couple of these different dozers. I was looking for the converted ones. There's a D7 and a D4, and they're just different capacity. But, yeah, so he took those and mechanically converted it. My father was super high IQ.