From Halopedia, the Halo wiki
Traxus Factory Complex 71 was a Traxus Heavy Industries storage installation located in Voi, Kenya on Earth. It was located right across a body of water in South Voi, near Traxus Factory Complex 09.
The warehouse was used to aid in the facilitation of the storage of Traxus supplies and goods. An abandoned warehouse near Traxus Factory Complex 71 was used as the basis of a War Games simulation for live-fire training.
The complex can be seen by looking outside the fans near the main playing area on the Halo 3 multiplayer level Foundry.
Complex 71, visible from the edge of Complex 09
Another view of Complex 71