Comparison context similarities to Energia   This has very striking similarities to the Energia system the concept of using a space shuttle systems hardware for launching other things isnt unique There are obvious differences too like stretching out everything and making it taller whereas the Energia just uses multiple generic strapons and the main engines were always on the bottom of the big tank for the Buran so in the sls they have to move them across   Im surprised its not in the see also section or used to provide some context for the articles subject Of course I have no idea if anyone notable has commented on it but for these kinds of inclusions nothing is required