I've seen the Orion Space Battleship pop up from time to time in space related alternate history, and I decided to do some additional research into it because I'm interested in using it in a timeline I'm working on. But I've run into a bit of a problem; I can't find any credible sources that this was ever a real proposal. A lot of places online talk about how it was supposed to have 5'' naval guns and 24 megaton nuclear missiles, and that the program was canceled by Kennedy because it scared him. But none of these places actually cite any sources, and the credible sources I do have about Project Orion do not mention the battleship proposal, not even in passing. Am I missing something? Where did the story about it scaring Kennedy come from? Or its armaments for that matter. For as popular is it seems to be in a lot of space related alternate history, I'm not sure I'm convinced that it was ever a real proposal.