Base Segundo Terra
From Halopedia, the Halo wiki
Base Segundo Terra was a UNSC military base located near Mexico City on the north American continent of Earth. Segundo Terra was a major facility for the UNSCDF of the region.
In 2552, during The Second Battle of Earth, SPARTAN-104, SPARTAN-058, and SPARTAN-043 used this base as a staging point to attack the Covenant incursions on Havana and the Yucatan Peninsula.