Lone Survivor by Marcus Luttrell.
Only started this the other night, and so far it's the bog standard "I was in Iraq/Afganistan/wherever and you don't understand what it is was like, but I was proud to server my country and my president" kind of book which seem to be 10 a penny at the moment.
It's very lightweight, there are better out there, I may end up abandoning it and switching to "The History of Spain"