At about `05:55` in Scott Manley's new video [NASA Might Be Giving Away A Saturn I Rocket - Here's Why I Love This Vintage Booster](https://youtu.be/W51wQeTYex0?t=353) he says:

>So the Saturn; the first four blockone Saturns, they didn’t have the fins. **The block two, they got the fins, because of course this is a rocket by Von Braun.**

Why did the block two Saturn I rockets get fins "because of course this is a rocket by Von Braun"?