Sergeant Rivera was an Army liaison working as intermediary between Stuart Campbell and Colonel Rosemont, as part of the research initiative focusing on reactor energy efficiency. As part of his duties, he operated without uniform, coming and going from Massachussetts Bay University like a civilian.
Rivera is mentioned only in Fallout 4.
- University Point terminals; Lab Terminal, Improved scattering patterns: "Progress has improved now that Curtis and I have full access to the lab. My parents think I've gotten a job at the credit union and have been pushing me to go into banking. If they knew Mr. Rivera is actually a sergent undercover, they would flip. We've been having much better results with containing the plasmons since we decided to try focusing the electron beam down to around 200 nm. The scattering patterns are showing up with much better grouping on the Cathodeluminescence graph. At this scale it may not end up being any good for reactor containment, but we might at least be able to improve energy consumption for small industrial or weaponry uses."