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Doesn't seem likely that they even need to remove it. An F-117 was shot down over Yugoslavia using a modified microwave oven as a lure, and an antiquated Soviet-era anti-aircraft system. Its remains were handed over to the Russians _and_ the Chinese. TL/DR: the nations that we're worried about having the low-RCS paint already have the paint, and whatever was secret about it is secret no longer.

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The article supposes that the paints were adapted and improved over time, so the paint on the airframes at retirement could be a decade more advanced, and that on current airframes could be two decades ahead, of that on the aircraft shot down.

Paint, maybe, though unlikely, but the airframe is almost certainly identical to the one that was shot down. The last F-117 was delivered to USAF in 1990. The aforementioned shoot-down was in 1999.

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