George Forty was a British Army officer who was the chief of staff at the gunnery school at the Royal Armoured Corps. He was later a director of the Tank Museum at Bovington.
Forty was a military historian and had written numerous books on military vehicles with a focus on armoured warfare.
More of a collector's item than a true reference, especially in view of Hunnicut's "Sherman Bible". Yet the book has its worth for modelers and Sherman fans alike, and does give a reasonably accurate overview of the Sherman's operational career. It does suffer from a rather uninspired editing and lack of 3 view drawings.