105th Shock Troops Division

The 105th Orbital Drop Shock Trooper Division is the first and best ODST division of the UNSC Marine Corps.

The 105th is a unit with great pride, each ODST from this unit gets a tattoo, and their motto is "Feet first into Hell." for this reason, they are nicknamed the "Helljumpers." They are infamous for their brutality - even to fellow soldiers. On one occasion, ODSTs from the 105th got into a fight with SPARTAN-117, as a result three of the ODSTs were killed.

The 105th ODST Division is the toughest of all the ODST Divisions and are notorious for their tenacity. Delivered to their targets via HEV's (Human Entry Vehicles), these soldiers are always in the most danger of being killed on a mission. In addition to special armor and training, the ODSTs carry Combat Knives, and are trained in long-term survival without reinforcements.

History
The 105th was around as early as 2525. Detatchments of the soldiers have been on a number of ships, including the UNSC Atlas.

As of 2525, the 105th was the only ODST unit in service. However, as the war against the Covenant expanded, the number of ODSTs has swelled, and there are several divisions. However, the SPARTAN-II unit still has more confirmed kills than any three ODST divisions put together.