In recent years, Unmanned Aerial Systems (UAS) have become a prominent segment of the aviation industry. From its history to future applications, this book explores the landscape of UAS. It discusses commercial and military applications, integration into the national airspace system (NAS), system functions, operational procedures, and safety concerns. It also addresses sensors, controls, automation, and a host of other relevant topics, including a survey of current and proposed U.S. and international regulations regarding UAS. This dynamic text is well-illustrated and also offers web-based resources.