CAPT Alexis "Puma"-A235 was a SPARTAN-III commando of the UNSC Special Warfare Command, attached to Special Warfare Group Three. Alexis was a senior member of SPARTAN Group December for many years, an elite group of SPARTANs who fought during many high-risk operations, most notably however, during the Fall of Reach. Alexis was more specifically an assault member of Fireteam Dagger, her call sign being Dagger Four. Some point after her tour aboard both the UNSC Infinity and UNSC Invictus, she was promoted to Captain, working closely with ONI's Section Three.