The camo on the one I saw was effective! I may have missed seeing the B-52 entirely if it hadn’t been for the crisp black shadow it was casting about 100 feet below and beside it. The shadow was distinctive and can’t be camoflauged.
Quite a few years ago I was driving a back road in the western section of New Jersey’s pine barrens. As I was transiting a cleared spot I noticed motion in my rearview mirror and slowed a bit to try to see what it was. Seconds later I was looking at the underside of an A-10 Warthog through my windshield. Then, a second one roared overhead. I’d guess they were at a couple of hundred feet altitude.
Maybe I was honored to be a “target” for a practice run?