Defense Support for Cyber Emergencies Response Act of 2023

This bill allows the Secretary of Defense or Homeland Security to order part-time military reservists (Selected Reserve) to active duty for up to 365 days without their consent to respond to serious cyber incidents threatening national security, the economy, or public safety. It directly affects reservists who may be called to active duty during designated cyber emergencies. Key provisions include defining "covered incidents" as cyber attacks on Defense or Homeland Security systems causing demonstrable harm, and granting Secretaries authority to deploy reservists without individual consent for these specific emergencies. Termination of such deployments requires a Secretary's order or new law, not just a presidential directive.