Leidos Holdings is a science, engineering, and information technology company that provides services and solutions in the defense, intelligence, civil, and health markets. It operates through three segments: Defense Solutions, Civil, and Health. The Defense Solutions segment specializes in mission systems and integration, command, control, computers, communications, intelligence, surveillance and reconnaissance technologies and services, maritime solutions, transformative software, analytics, logistics services, and space systems. The Civil segment offers infrastructure, systems, and security solutions for government and commercial customers. The Health segment comprises health information management services, managed health services, digital modernization, and life sciences research and development activities.