Lieutenant general
From Halopedia, the Halo wiki
Template:FactOrFictionTemplate:Realworld {This Rank has not yet been mentioned in the Halo Universe}
A Lieutenant General typically commands a corps-sized unit (20,000 to 45,000 soldiers). A Lieutenant General may be referred to as a three-star general, named for the three stars worn on the uniform. This rank is the Naval equivalent is Vice Admiral.