National Security Letter

Category Abbreviation:
Category Description:

Related to administrative orders sent to compel the recipients of the letters to provide information to federal investigators. A national security letter (NSL) is a law enforcement investigative tool similar to a subpoena and is most commonly issued by the FBI. NSLs are used to obtain information from companies as part of national security-related investigations.

Required Warning Statement:


Required Dissemination Control:




  • Contents of the order
  • Recipient's personal information


50 USC 3162(b)

Applicable DoD Policies