The title says it all, “An Ineffective System: The M247 Sergeant York.” While the book details the issues with the system, it also gives a comprehensive history. The book focuses on the needs and requirements for the system with details about the system and the problems that the technical team tried to overcome while trying to fill the void for this type of air defense system. This is the most comprehensive book I have ever read on this subject. It is worth downloading. The only thing I would change is to increase the page length by providing additional information and or illustrations/photographs.