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.
