Here it is The caption mentions Wilhelm, and the picture looks contemporary to when he would be leading but i don't see any other obvious connection. I reverse google image searched it, but all that came up was stuff about fire fighting.
This is a guess, but the image looks like it was taken on a ship (wooden planks on the floor, piles of what looks like rope in the background) and there were several ships named Kaiser Wilhelm or similar, so it might be a picture of a firefighting drill on one of those ships.
