The picture he was cleaning showed an armored figure standing in a desolate landscape. It had no weapon, but held a staff bearing a strange, stiff banner. The visor of this figure’s helmet was entirely of gold, without eye slits or ventilation; in its polished surface the deathly desert could be seen in reflection, and nothing more.
(I remembered this roughly, but the exact text is from here. The picture I nicked and cropped doesn’t match this description; I don’t know if there is one that does).
Ultimately, the Apollo programme was rather pointless, a dead end. It must have required great courage to trust in the lunar lander and return system. And the entire thing was of great grandeur, yes, and inspiring to many of course, and produced some unforgettable images. And text. But the sane consequent was robot exploration, and even that (e.g. Curiosity) lacks vision in a way (“What shall we do next?” “Oh, I dunno, how about we just dump something bigger down on Mars?” “I suppose it’ll have to do”). The path forwards must be making it self-sustaining, which I think points towards comet or asteroid mining or the like.
[Update: http://upload.wikimedia.org/wikipedia/commons/0/09/Apollo_14_Shepard.jpg might be the image that Wolfe had in mind, though it is too cluttered -W]