According to the Wikipedia page (man, I do hate writing those words but I don't have the time to dig up better source), Bull was rubbed out for agreeing to improve the more practical aspects of the Iraqi missile delivery system- I.e. the re-entry vehicle for SCUD missiles- not the gun, which, by all the accounts I could find, was hilariously ineffective by any measurable standard. Baby babylon was "not considered a risk by Israel," and big babylon was useless as artillery. Seems like it was never tested as a space gun, as the prototype was poorly designed. And had it succeeded, it would have been useless as well, as its deployment method was easily monitored. How bonkers was this guy though, huh? Obsessed with shooting things into space with a big gun no matter what the cost. I'm sure there's a Cheap Freudian joke to be made here, but I'm not gonna be the one. Oops