It has a Copyright notice but there is no way to find out who took it.
It’s appeared on Reddit, so this isn’t the first time the Copyright has been violated. In fact, my posting it here isn’t a violation. It’s Fair Use since I’m actually trying to find the owner/photographer. Once that’s accomplished, I’ll remove the image.
Same-day update: It’s difficult to decipher the Copyright text. It looks like “atomic supep men” but I’m not convinced “atomic” is the first word. I’ve tried various manipulations in a paint program but there’s not enough contrast in the letters of the first word to be certain. Anyone have NSA-level software or better skills than my amateur ones?