Amentum Holdings, Inc. provides mission-critical, technology-driven services in government and commercial markets. It operates through two operating segments: Critical Mission Solutions and Cyber & Intelligence. The Critical Mission Solutions segment provides test, training, and operations services for missile defense systems, IT and engineering services to defense clients and the space sector, technological solutions, including installations, decommissioning, and environmental remediation to energy clients, and other highly technical consulting solutions. The Cyber & Intelligence segment provides advanced cyber training and data analytics for government professionals, advanced communication systems and aerial mapping technologies to national security clients, and other technical services for United States defense and intelligence clients. The company was founded on November 26, 2019 and is headquartered in Chantilly, VA.