Stevens and Roberts decided to collaborate on a pictorial reference document when Stevens, a former U.S.serviceman, found that such photographs submitted to the military simply ‘disappeared’. There was much work devoted to weeding out the obvious ‘hoax’ photographs, a practice that has sadly accelerated with the advent of such facilities as Photoshop. This book and its companion volume were published in 1986 and contain decades of intriguing photos, diagrams and accompanying text.