A pilot training in one of America's most expensive weapons systems ejected over South Carolina. Officials can't find the F-35 he was flying.

Tech Insider
A jet streaks across the sky.
An F-35 Lightning II doing maneuvers to the Eglin Air Force Base runway.

US Air Force photo/Samuel King Jr.

3 Marines were killed and 20 injured after a US helicopter crashed on a training exercise in northern Australia

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MV-22 Osprey
The Marines were killed when an MV-22 Osprey helicopter crashed in Australia.

Kyodo News via Getty Images

Marines fooled a DARPA robot by hiding in a cardboard box while giggling and pretending to be trees

Tech Insider
United States Marines and representatives from Boston Dynamics look at Spot, a four-legged robot designed for indoor and outdoor operation, during the Defense Advanced Research Projects Agency Robotics Challenge at the Fairplex June 5, 2015 in Pomona, California.
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