If you can pick one and only one favourite WWII book of all time which would it be and why?

Mine would be Tanks of WWII by Chris Ellis: it is not a classic tome; it isn't accurate either and it contains low print quality illustrations only but I used it to scratch build models as a kid (like a JS2 from a plastic JS3 using a lot of milliput!) and as my camoflage template too and it expanded my interests to consider all the Nations involved rather than the narrow Normandy 44 perspective I grew up with.

Odd choice and definately based on nostalgia rather than an objective view of its merits but there we are