The Canadaians started that with their F-18s. After someone in the USAF brightened up...we started doing it as well.
And I do not know if it is the same...but I have seen an all black A-10 two seater [test aircraft] with a clear canopy, used to display geared up, precision night attack variant. Dont know whatever came of it though...
I'm guessing it was the same aircraft. Here's the plaque that was mounted in front of the A-10 in the picture. You had to stand right in front of the gatling gun to read it! :)