What is the main role of the Defense Information Systems Agency (DISA)?

The main role of the Defense Information Systems Agency (DISA) is to secure communications and provide information technology (IT) services for the Department of Defense (DoD). DISA plays a critical part in ensuring that the DoD’s communications are safe from threats and vulnerabilities, thereby enabling effective command and control during military operations. This encompasses a wide range of services, including cybersecurity measures, the development and maintenance of secure communication networks, and support for various IT initiatives that are essential for the operational capability of the military.

In the context of the other options, developing new communication technologies is indeed part of DISA's responsibilities but is not its primary focus. Managing logistics for Navy operations is a responsibility that falls under the purview of Navy logistics commands rather than DISA. Lastly, providing social media strategies for military communications is also outside the primary mandate of DISA, as it centers on securing and managing communication infrastructures rather than developing strategies for civilian social media engagement. Thus, the role of DISA is best captured by its focus on securing communications and IT services for the DoD.