They did? I've not heard of that, and a cursory search isn't finding anything. Got any more info on this, which rocket, etc? I'd love to learn about that.
https://www.youtube.com/watch?v=JzXcTFfV3Ls&t=3s
Edit: Another link with probably better info
https://www.youtube.com/watch?v=AC1wgWi9WWU
TLDR: DC-X (Delta Clipper X)