can you provide the source?

The quote "I was actually able to wave to the co-pilot, a fellow on the right-hand side of the plane. He waved back, and actually smiled at me" is attributed to Larry Weaver, a crewmember on the Liberty. It was allegedly originally written in a book called "Assault on the Liberty" by James M. Ennes, but I ordered a copy to confirm

Have you tried to look and had no luck?

Its the obligation of the person making the claim to provide a source (or other evidence), not the other way around.