Team Delta

Team Delta was a splinter team of the SPARTAN-II Red Team of the United Nations Space Command. It was made up of six Spartans and four Marines. The Spartans were those who were wounded in the jump from Pelican Bravo 001. The team was made up of Will-043, Isaac-039, Vinh-030, three other Spartans, and the four Marines of Charlie Company.

Fall of Reach
After the botched landing on Reach which caused the death of four SPARTAN-IIs, Red Team secured the Orbital Defense Generators then split up. Team Delta was ordered to take several Warthogs and the survivors of Charlie Company to secure the Spartan fallback point CASTLE Base. William, Isaac and Vinh were separated from the team as they fell back to CASTLE Base. They secured a way down to the base's front door, as the elevator had been destroyed but were stuck outside the door until the remainder of Team Alpha used Oly Oly Oxen Free to open the door. Inside they found Dr. Catherine Halsey.

Inside CASTLE Base, Dr. Halsey treated their wounds and sent them on errands for extra armor, prototype weapons, and other items that were there. Soon after, the Covenant started their offensive upon the base and Dr. Halsey was forced to activate Operation: WHITE GLOVE and destroy the base, which forced the team down into the titanium mines below the base. While wandering the mines, Frederic-104 discovered a Forerunner tunnel that led to a massive, twelve story Forerunner cavern which contained a strange Forerunner crystal.

In the massive cavern, the two teams came under attack by the Covenant, causing the them to retreat into a tunnel, which was sealed after two satchel charges went off and Isaac and Vinh disappeared. Some time later, the group was rescued when the tunnel became unblocked by another explosion. On the other side they found John-117, Sergeant Major Avery Johnson, Vice Admiral Danforth Whitcomb, Team Gamma and the ODST Corporal Locklear. After a brief battle with the Covenant, they escaped in a Spirit dropship to the UNSC controlled Ascendant Justice.

Slipspace battle
When the ship jumped into slipspace, the Forerunner crystal found on Reach distorted Slipspace. Several other Covenant cruisers were engulfed in the slipspace bubble and a vicious space battle ensued. Shots from the cruisers disappeared and reappeared in random places and destroyed several of the Covenant ships. On board the Ascendant Justice, several rogue units of Sangheili sabotaged the ships' plasma conduit, forcing the Spartans to perform a dangerous space mission to repair it. When a rogue plasma torpedo hit the dropship, Spartans Anton-044, Li-008 and Petty Officer, Second Class Shiela Polaski were killed. Their ship then dropped out of the bubble and back into normal space.

Operation: FIRST STRIKE
The remnants of Team Delta then proceeded to help John-117 in the carrying out of his well planned Operation: FIRST STRIKE. This involved the Spartans overloading the power core of the Covenant space station Unyielding Hierophant and destroying 500 Covenant capital ships. The operation was going well until the group came under attack by a pack of Jiralhanae and Grace-093 was killed in the attack. The Master Chief overloaded the core and destroyed the ship and almost all of the 500 ships.

Dissolution
With most of the SPARTAN-IIs who had constituted Red Team during the Fall of Reach dead or missing, Will-043, the sole surviving former member of Team Delta would be integrated into Blue Team, consisting of Fred-104 and Linda-058 after John-117 left Earth aboard the in pursuit of the Solemn Penance. The new arrangement of Blue Team would then defend Earth over the course of two weeks, before being reassigned to Onyx in early November.

List of appearances

 * Halo: The Fall of Reach
 * Halo: First Strike