Training isn't everything. If you have two people who both play paint ball and one practices 2 more hours then the other guys but the other guy actually plays 10x as much he is going to obliterate the other guy. America has been fighting in waes for over a decade continually. Our soldiers are much more weathered and fight better. Our navy is more advanced and if you didn't know those nuclear subs that are the "most advanced in the world" the missiles in them and the system used to fire them are both supplied from the US so we would have to same or better tech for our subs. The British challenger 2 is a good tank but the abrams in several international competitions came out on top. The UK wouldn't be able to hold out from the US for long. Our marine corps is almost as big as the UK'S entire armed forces.