Marine Corps Warfighting Publication (MCWP) 2-22, Signals Intelligence, serves as a basic reference for understanding concepts, operations, and procedures for the conduct of signals intelligence (SIGINT) operations in support of the Marine air-ground task force. This publication complements and expands on Marine Corps Doctrinal Publication 2, Intelligence, and MCWP 2-1, Intelligence Operations, which provide doctrine and higher order tactics, techniques, and procedures for intelligence operations.