Military Drones Present And Future: Visual TourThe Pentagon's growing fleet of unmanned aerial vehicles ranges from hand-launched machines to the Air Force's experimental X-37B space plane.
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K-Max, another unmanned helicopter, is based on a conventional helicopter design. Used by the Marines since 2007, primarily for hauling cargo, it can lift and deliver three tons of equipment when cruising at low altitude and more than two tons at 15,000 feet.
Image credit: Lockheed Martin
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