Serialised Book?

There was a book serialised in The Sun last week. I only managed to read the part on Wednesday, but there were also excerpts from the book in The Sun on Monday and Tuesday. The book was about snipers (I think) in Iraq, and was written by a soldier who'd served in Iraq.

The excerpt on Wednesday described how a Colonel had come to their base, and changed the Rules of Engagement concerning shooting civilians who were used by the Taliban, in order to target mortar fire accurately.

Does anyone know which book it was from?

I remember the book is supposed to be released on the 31st of August if that helps....

Thanks in advance.