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This article is about the Marine Unit in Halo 2. For the Halo Costuming Community Website, see 405th.com.
The 405th Marine Infantry Division is a UNSC Marine Corps unit. Stationed at Diego Garcia, it was among the first UNSC forces to respond to the Covenant's invasion of Mombasa, Kenya during the Battle of Earth.
The 405th is based out of Diego Garcia. They arrived on scene during the Battle of Earth in Mombasa, Kenya on Earth. They went on to fight in the city streets of New Mombasa.
The 405th assisted SPARTAN-117 in the destruction of a Scarab that was moving through the city, and assisted the 17th Marine Regiment after most of their numbers were dwindled. Surviving members of this unit then traveled to Installation 05 along with SPARTAN-117 aboard the UNSC In Amber Clad. It is assumed all, or almost all of them, were killed in either the Battle of the Quarantine Zone or, although more unlikely, the First Battle of High Charity. It is also possible that they were attacked by the Flood as some of the Combat Forms spilled out on the UNSC In Amber Clad.
Known members of this unit include:
- If Staff Sergeant Banks was in command of A Company, as Corporal Perez says, that means that all of the Lieutenants in the 405th have been killed or none were in the immediate area.
- It is quite possible the unnamed Colonel from Halo 3: ODST was part of the 405th since it is a division sized unit.
- The 405th is also an online community that creates Halo armor.