The Defense Information Systems Agency (DISA) is an agency of the United States Department of Defense that is responsible for providing information technology and communication services to the military. There are several synonyms that can be used interchangeably with DISA such as the Department of Defense Information Network (DODIN), the Defense Information System for Security (DISS), and the Defense Information Technology Contracting Organization (DITCO). These are all closely related to DISA as they also play a critical role in safeguarding, managing, and coordinating the various technological systems used by the U.S. military. Regardless of the term used, each organization is focused on providing the highest levels of security and efficiency to ensure that the military's communication and data networks remain secure and operational at all times.