Oi, not the same old discussion once again, oh dear. This thing never ends. :-)) You are right in your own way because it may be your thinking culture and so are others who tend to think a bit differently. Ofcourse if only say the e.g. US Army would like to keep the tyre the same. The only thing in common here is that the wheel is circular : http://www.youtube.com/watch?v=2wAvxQfusWU
Oi! No point inventing a square wheel. The circular one works perfectly.