The Pentagon's growing fleet of unmanned aerial vehicles ranges from hand-launched machines to the Air Force's experimental X-37B space plane.
Here's another look at the X-47B as it's lowered onto the USS Harry S. Truman, the first aircraft carrier to host the testing of an unmanned aircraft. With a 62-ft wingspan, the X-47B can fly at 40,000 ft.
Image credit: Navy
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