Division

A Division is a large military unit of UNSC soldiers. It is unclear if UNSC forces have continued to follow the same battle order scheme for Divisions as it has for Companies and Battalions, but this appears to be the case. If so, Divisions would probably number around 10,000 to 20,000 soldiers.

Judging from a comment from Lord Hood, there are no less than five Divisions of special forces ODSTs in existance, which likely puts the total number of UNSC Marine Corps divisions at a much larger number.