Outpost 25-B is the Red Team base at Rat's Nest, where Grif and Simmons were transferred to after their service at Blood Gulch. Grif was promoted to Sergeant and given command of this outpost because Sarge refused to transfer out of Blood Gulch with them. In the events of Reconstruction: Chapter 9, the rest of the Reds, led by the Red Mutineer, attempted to execute Grif and Simmons because Grif had sold all of the Red's ammunition to the Blue Team. Lucky for them, Sarge showed up and interfered before they were executed.
|Project Freelancer: 1-Blood Gulch: 1A 1B · 9-Sidewinder · 17-Valhalla: 17A 17B · 25-Rat's Nest: 25A 25B · 48-High Ground: 48A|
|Federal Army of Chorus: 22-F.A.C. Outpost 22 · 37-F.A.C. Outpost 37|
|Unnamed: Battle Creek · UNSC Wind Power Facility · Danger Canyon · Timberland|