ULA Challenge

ULA needs your help! Make a fictional rocket for them to join their upcoming array of vehicles. Remember, it must be modular, and it can be a part of a historic rocket family. Must be a successor and must be fictional. Remember that.

Examples:
Titan V (Titan family)
Delta V (Delta family)
Atlas VI (Atlas family)
DO NOT MAKE EXAMPLES:
Saturn VI (That’s not needed!)
RECOMMENDATIONS:
SMART Reuse - First to be used on Vulcan, SMART Reuse involves the engines separating from the rest of the first stage, deploying an inflatable heat shield/decelerator, then as it hits the thicker parts of the atmosphere, it deploys a parafoil and a helicopter catches it.
SRBs - Pretty much every rocket type ULA ever operated has had the option to have SRBs, as part of it’s modular design. Maybe your rocket can have SRBs!
Triple core (or maybe even 5 core!) - Your rocket can also have multiple cores together! It can be 3 like Delta IV Heavy or maybe even 5 like Angara!
Modular code - Like Atlas V, you can have a code denoting what the rocket’s characteristics in a certain configuration are! (Ex. 552 - 5 meter fairing, 5 SRBs, 2 upper stage engines).
Multiple fairing sizes - Atlas V uses two different fairings, so maybe your rocket can have the same thing!
It can be anything, but there is one word that goes into ULA - MODULAR.
All ULA rockets are modular. a type of multistage rocket which features components that can be interchanged for specific mission requirements. (Source: https://en.wikipedia.org/wiki/Modular_rocket). So this is a requirement for the challenge. And it also must be a successor. But other than that, those are the only two rules. The choice is yours, it’s a challenge of skill. Then ULA can have an entire fleet of rockets depending on their mission needs! And remember, must be fictional rocket.