105th could refer to the following:
- 105th Shock Troops Division - The first and toughest unit of Orbital Drop Shock Troopers.
- 105th Drop Jet Platoon - An UNSC platoon massacred at Jericho VII by Unggoy in Halo: The Fall of Reach.
- Could possibly be a reference to the Starwars series' "501st" legion. The 501st had a reputation for being rugged and effective, as does the 105th ODSTs
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