Great book - finished it about a week ago:
http://www.amazon.com/Taliban-Dont-Wave-Robert-Semrau/dp/1118261186
My favourite line was when he was talking about fighting along US troops - he wrote something to the effect: "I loved the Americans, they were great to fight alongside, they'd give ya the shirt off their back - they just tried to kill you sometimes."
He then goes on to tell the story of how his unit and the Afghan troops they were training got lined-up by an A-10 while on patrol. As the a-10 turned and was coming in low for a gun pass he got everybody to wave like mad at the pilot - it saves their assess - he then goes on to tell the Afghans if you get lined up by aircraft wave like crazy, 'cause the Taliban don't wave. Great read.
Promptly bought!
It's this generation's version of Charlie Don't Surf!