Anyone who wants to be taken seriously in the European defense industry shows up to Eurosatory, France’s largest defense trade show, held every two years. This week, the industry is once again showcasing its latest advances at the sprawling exhibition grounds in Villepinte, near Paris. More than 2,000 exhibitors mingle with military officials, politicians, and industry professionals. With  order books full , the mood should be upbeat. European governments want to reduce their defense dependency