Leidos Holdings, Inc. is a global science and technology company. The Company provides technology and engineering services and solutions in the defense, intelligence, civil and health markets. Its segments include National Security Solutions (NSS), Information Systems & Global Solutions (IS&GS), Health and Infrastructure (HIS), and Corporate and Other. The NSS segment provides a portfolio of national security solutions and systems. The IS&GS segment focuses on providing information technology, management and engineering services to civil, defense and intelligence agencies of the United States government. HIS segment serves customers, including the United States federal government, state and local governmental agencies, foreign governments, healthcare providers and commercial enterprises. Its infrastructure business is focused on integrating and protecting physical, digital and data domains. The Corporate and Other segment includes the operations of various corporate activities.