The book 'Sweating the Metal' is all about flying helicopters in Afghanistan (the Chinook in this case) and the rules and restrictions that are imposed on the crews are far more stringent then any I endured during my service. That said, the helo's are often operated at best speed and the very minimum of altitude to avoid fire from the Taliban who have no rules of engagement. Low level training in the UK is limited - so how do the crews practice unless they do it unofficially?