From Halopedia, the Halo wiki
Beta-Red, also known as Team Beta, was a splinter team of the SPARTAN-II Red Team. During the Fall of Reach, Beta-Red was the largest splinter of Red Team, consisting of six Spartans[Note 1] led by Beta-Romeo Actual.
Fall of Reach
On August 30, 2552, the Spartans of Red Team were deployed to the surface of Reach by Pelican Bravo 001. En route, the pilot, Flight Officer Mitchell, was killed by pursuing Seraphs. Senior Chief Petty Officer Fred-104, the leader of Red Team, ordered the Spartans to make a high-altitude jump to the surface; four Spartans were killed in the jump and several were wounded. After rendezvousing, Fred divided Red Team into four splinter teams: Alpha, Beta, Gamma, and Delta. Beta-Red were tasked with defending Reach's orbital defense platform generators against Covenant attack.
Beta-Red managed to get a transmission to Fred and the UNSC Pillar of Autumn, warning them to stay away from the planet because most of the generators had been destroyed, and that they would attempt to protect the several remaining generators. They were eventually deployed to Recon 43's position to reinforce a Marine unit, Charlie Company, defending Facility Alpha 331 from two division-strength units of Covenant armored vehicles, fighting deep into the center of the enemy formation. A dropship piloted by Iron Fist attempted to retrieve Beta-Red, but the evacuation was interrupted by the descent of three Covenant cruisers from cloud cover directly overhead. Artillery support from the destroyer UNSC Majestic was called in to destroy the three cruisers and any surviving Covenant forces; Majestic fired six MAC rounds at the targets, presumably taking the lives of Beta-Red, who had remained behind to buy Charlie Company enough time to evacuate.
List of appearances