Fort Worth, Texas — “This room is the most advanced painting facility in the world,” retired US Air Force pilot and F-35 simulation instructor Rick Royer told me as we toured Lockheed Martin’s highly secure plane facility.

The Aircraft Final Finishes bay is where America’s most expensive weapons system gets coated with a highly classified stealth technology, which makes it invisible to radar.

After the jet is assembled and before it can take flight, three laser-guided robots apply the Radar-Absorbing Material (RAM) to each of Lockheed Martin’s F-35 Lightning II variant aircraft.

Here’s all we know — and can share — about how the F-35 gets its invisibility cloak:

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