Back in 1962, NASA engineers fought over whether to trust nuclear or chemical...

https://travispyuj085.raidersfanteamshop.com/nuclear-vs-electric-propulsion-for-mars-which-one-wins

Back in 1962, NASA engineers fought over whether to trust nuclear or chemical engines for the Moon. The public saw a seamless mission, but these memos reveal a mess of bruised egos and real technical fear