In rec.aviation.military Greasy wrote:

....


Still, no U-2 variant ever entered naval service. At the same time,
Boeing proposed a much larger aircraft of this type (i.e., a powered
glider with a 200-foot wingspan) for the ocean surveillance role. The
Navy did not build it.

I wonder if this could be (or be a variant of) the Boeing
Condor which is on display at the Hiller Aviation Museum:
http://www.hiller.org/condor.shtml