Other than sheer audacity? Getting out to Mars, Jupiter and back without the need for refuelling at either end or long, slingshot trajectories that'd be rough on crew expendables.I hope not. Orion never rubbed me the right way. The Sea Dragon was great - a post S.V rocket to launch huge colony modules, that's fine. But what do you use orion for, if you have BDR launches already?
I mean if this show is going all in on the would-have-beens of the space race, why not go all in? I fully expect to see a Buran at some point, so why not a Soviet knock-off Orion too? It's a fair bet that in this timeline the PTBT either never happens or looks very different, so an increased use of nuclear technology seems inevitable.
Plus if both parties are set on warming up the Cold War in space, they're going to want at least some pretence to test deployable tactical payloads in a vacuum.
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