# Official Website: Northrop Grumman Promontory

**Type:** source
**Status:** Useful
**Confidence:** Medium
**Source Type:** Official Website
**URL:** https://www.northropgrumman.com/what-we-do/space/missions/artemis/program
**Publisher:** Northrop Grumman Corporation
**Accessed:** 2026-06-19
**Updated:** 2026-06-19

## Summary

Northrop Grumman's Artemis program page describes the Promontory, Utah facility's role in manufacturing solid rocket boosters for NASA's Space Launch System. The parent company's space division site covers both the Artemis booster program and the broader solid-propulsion portfolio including the Sentinel ICBM.

## Useful Claims

- Northrop Grumman describes its solid rocket boosters as providing 75% of the Space Launch System's total thrust at liftoff, with each booster measuring 153 feet tall and producing approximately 3.6 million pounds of thrust.
- The company describes the Promontory facility as the manufacturing site for SLS solid rocket boosters supporting the Artemis program, which aims to return humans to the Moon.
- NASA-linked reporting describes the BOLE (Booster Obsolescence and Life Extension) motor as "the most powerful segmented solid rocket motor ever built," with a successful 2024 test fire at Promontory.
- The Promontory facility traces operational history through the ATK and Thiokol eras to approximately 80 years of on-site solid motor manufacturing in Box Elder County, Utah.
- The site describes Northrop Grumman's role in the Sentinel ICBM (Ground-Based Strategic Deterrent) program, the $140B+ replacement for the aging Minuteman III.
- Workforce at the Promontory facility is reported (third-party and corporate materials) at 5,000+ engineers and manufacturing personnel, making it one of the largest aerospace employers in Utah.
- The company cites a near-monopoly position in large segmented solid rocket motors at the scale required by SLS and Sentinel.

## Reliability Notes

This is an official corporate source for a publicly traded defense prime (NYSE: NOC). Product and mission descriptions are reliable for understanding program scope. Workforce headcounts, program timelines, and capability claims should be cross-checked with NASA program pages, DoD contracts, and independent reporting. BOLE and Sentinel program status are subject to government budget decisions.

## Related Pages

- [Northrop Grumman — Promontory Facility](northrop-grumman-promontory.md)