Going back all the way to the late 1930s, dark grays have proven themselves to be the best colors for a variety of camouflage situations. Aircraft below 10,000 feet tend to appear dark, so that is the one place where dark grays don't work all that well. Still, most missions are flown above 10,000 to avoid small arms. Above 10,000 feet, there's enough atmosphere below you to reflect a bunch of light, so aircraft tend to silver up a bit - darker shades are harder to see. (That's why the AAF chose Neutral Gray during WWII.)
From above, lighter aircraft tend to be pretty visible against the earth or sea. I had an F-16 ride out of Eielson in the mid-90s - on takeoff we overflew six medium/light gray F/A-18s approaching for landing. They might have been more visible if they were painted neon red, but probably not by much. And while dark greens or blues can be nice if you're in close, as you start backing off, you can't distinguish the colors - gray is just as effective.
Air-to-air at altitude, everything seems pretty dark unless the cloud base and sun are just right - in nearly every other situation the darker tones are the best.
At night, dark gray offers less visibility than flat black. (However, visually, gloss black is the hardest to detect.)
For me the big question is why MORE aircraft aren't wearing Gunship Gray...
But I certainly won't hold its absence against you, seeing as how the C-23 was a bit of an odd USAFE only duck. I'm currently wondering if my photo may pre-date Euro-I as there's an MP officer wearing the old style helmet within the photo. If so, this particular shade of Gunship Grey that isn't really Gunship Grey might not actually be on the FS register. It might be UK spec paint--a sort of reverse Phantom scenario.
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