Specific SSR (Special Service Request) codes can vary between airlines, and they may have different codes or procedures for accommodating U.S. Federal Air Marshals. Generally, SSR codes are used to convey special requests or services to the airline.
For situations involving law enforcement officers or Federal Air Marshals, airlines often have specific codes or procedures designated for security-related requests. It is recommended to contact the airline directly or refer to their official documentation to obtain the most accurate and up-to-date information on the appropriate SSR code for U.S. Federal Air Marshals traveling on official business and presenting law enforcement credentials.