My good friend, James Corum, has just had his new book published "Fighting the War on Terror: A Counterinsurgency Strategy." Jim very kindly invited me to dinner at All Souls College last year; he was on a two term visiting fellowship during which he was working on this book. He has also written a couple of books on the Luftwaffe, and "The Roots of Blitzkrieg: Hans Von Seeckt and German Military Reform" which tells of the first stage of the build-up of German military power between the wars. His writing is lucid and engaging, making his work accessible to the non-specialist.
Here is a link you can use to pre-order the book from Amazon UK: