Mack Crawford on X: "A Martin Marietta Unmanned Launch Vehicle flying in its heaviest configuration, with 2 reusable engine pods and a hammerhead fairing. Reminiscent of @ulalaunch's old proposal for a semi-reusable
KerbalX - medium fly back booster
Liquid fly-back booster - Wikipedia
Saturn Shuttle with Flyback Booster - YouTube
Liquid fly-back booster - Wikipedia
NASA reusable “Flyback” Booster concept art, 1971
Baikal
Stock] [1.05] Hurricane Launch Vehicle Family - KSP1 The Spacecraft Exchange - Kerbal Space Program Forums
1/80 Fat Albert Orbiter on Flyback Booster by rlkitterman on DeviantArt
Our Reusable Fly-back Rocket | Pulsar Aerospace
532 Flyback Booster – numbers station
Kerbal Space Program - Testing this flyback booster! #KSP By BlakeMW https://goo.gl/TwZ5TH | Facebook
The Zenit flyback booster - a fully reusable rocket booster for the Energia II : r/WeirdWings
Baikal Heavy Test Flight with Flyback Boosters - YouTube