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Amentum is a global leader in advanced engineering and innovative technology solutions, serving government and private-sector clients with critical mission support across national security, environmental management, and nuclear operations.
Mission Support & Test Services, LLC (MSTS)
MSTS manages and operates the Nevada National Security Site for the U.S. Department of Energy, providing high-hazard experimentation, nuclear security support, and radiological emergency response capabilities.
Mission Support & Test Services, LLC (MSTS) manages and operates the Nevada National Security Site (NNSS) on behalf of the U.S. Department of Energy's National Nuclear Security Administration. The organization employs over 2,750 people across a range of technical domains, including nuclear security, high-hazard experimentation, engineering, and field services.
MSTS provides large-scale, high-hazard national security experimentation and incident response capabilities. Its work supports the stewardship of the nation's nuclear deterrent and contributes to nonproliferation and arms control initiatives. The company also executes national-level experiments and offers nuclear and radiological emergency response capabilities and training.
Beyond its primary mission, MSTS serves as a long-term environmental steward of the Nevada National Security Site, addressing the Cold War legacy. Employees are called upon to innovate, collaborate, and deliver solutions to difficult nuclear security challenges.
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