Ryan Nagelhout 
Military Helicopters [PDF ebook] 

Helicopters are special machines that can hover in place and do many different tasks that most planes can’t handle. The military uses many different kinds of helicopters all over the world, and this book will dive into what makes these mighty vehicles so special. From early helicopters to the state-of-the-art machines that power the military today, readers will explore the machines that make a difference in the various branches of the United States military.