For John, BLUF: Not actually made of spruce, but rather birch. Nothing to see here; just move along.
From Warfare History Network, by Mr Allyn Vannoy, 31 December 2018.
This is the story of Howard Hughes' flying boat and its flight inside the breakwater of Long Beach, California.
It is also the story of imagination and of bureaucratic efforts to accomplish things. And the power of Congressional hearings.
Hat tip to my Brother, Lance.
Regards — Cliff