Question: Which booster was used to send the 1st American into orbit?
Sentence (from "Orion abort modes"): Like the Apollo Command-Service Module (CSM), the Orion CEV will use the Launch escape system (LES), a solid-fueled tractor rocket that will be able to pull the Orion crew module away from a malfunctioning Space Launch System (SLS) rocket during the initial launch phase.
Relevant evidence: No