What is the dark spot visible below the cockpit on A-10s?

Annotation by Deane Barker • •
https://aviation.stackexchange.com/questions/2078/what-is-the-dark-spot-visible-below-the-cockpit-on-a-10s
Narrative

Some fighter jets have a false cockpit painted on the bottom of the fuselage to make it harder to figure out its orientation and direction.

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