Under which Title of the U.S. Code does the National Security Agency (NSA) protect critical civilian infrastructure?

The National Security Agency (NSA) is primarily concerned with signals intelligence and information assurance, which includes the protection of critical civilian infrastructure. This responsibility falls under Title 50 of the U.S. Code, which pertains to war and national defense. Specifically, Title 50 outlines the legal framework for the NSA's operations, including those related to national security and protecting the nation’s critical assets from threats.

Title 10 deals mainly with the organization and general procedures of the armed forces, while Title 32 primarily concerns the National Guard and its operations in state service. Title 18 relates to crimes and criminal procedure, not specifically focusing on national security infrastructure. Therefore, Title 50 is the appropriate legal authority that grants the NSA the power and responsibility to safeguard critical civilian infrastructure.