Britain is doing just fine in Iraq and Afghan. They just don't have the resources to go much farther. OTOH, we still have guys in Germany that are only hunting Bambi. And in a few other places. Australia has a crack military team. Russia is getting mad at Iran- they got slapped in the face. The OSI has been working with Spetnatz teams in a few 'stans for years. China doesn't like this scene in Iran either, they have their own unruly Muslims to deal with in their western provinces. If the US, Russia and China join and tell Iran there is no step further for them, war will be prevented.
I would appreciate a German contribution if it comes to an armed conflict NATO vs. Iran. I just hope that this time, NATO will act as one on Iran - unlike Iraq, the necessity of stopping Iran with all our might should not be put in doubts by the media and Left.
Russia and China do not care of there is war or not as long as the U.S. is the one doing the fighting.
Russia and China will sell Iran whatever Iran wants to buy, force the U.S. to deal with the messs and then laugh all the way to the bank.