That's nothing new. Read what Heinlein has to say about the making of Destination Moon in 1949 in his Guest of Honor Speech at the Rio de Janeiro Movie Festiva

That's nothing new. Read what Heinlein has to say about the making of Destination Moon in 1949 in his Guest of Honor Speech at the Rio de Janeiro Movie Festival twenty years later. It was published in the posthumous tribute collection, Requiem.