Drones are fast and sneaky military aircraft. But did you know when the military started using drones? Or that they can be as small as an insect? Discover more about drones in this look at these impressive aircraft! Learn about different military vehicles in the Military Machines series-part of the Lightning Bolt Books® collection. With high-energy designs, appealing photos, and lively text, Lightning Bolt Books® bring nonfiction topics to life! Book jacket.