4 Charlie 27 (Earth-2042)

4 Charlie 27 was the callsign of a GRSC Army trooper from 4 Charlie stationed in New Andria during the Fall of Reach.

Biography
During the Siege of New Andria, 4 Charlie 27 and his unit were sent to Club Errera in the Vyrant Telecom Tower to destroy a Separatist Covenant communications jammer, but became pinned down by a group of Mgalekgolo and B2 super battle droids. SPARTAN-B312 was able to kill the Mgalekgolo and the battle droids, thus completing the team's mission.

Source

 * https://www.halopedia.org/4_Charlie_27