MCRP 2-10A.1, Signals Intelligence, serves as a basic reference for understanding concepts, operations, and procedures for conducting signals intelligence (SIGINT) operations in support of the Marine air-ground task force.  It describes aspects of SIGINT operations including doctrinal fundamentals, equipment, command and control, communications and information systems support, planning, execution, security, and training.  This publication complements and expands on Marine Corps Doctrinal Publication 2, Intelligence, and Marine Corps Warfighting Publication 2-10, Intelligence Operations. The target audience is intelligence personnel responsible for planning and executing SIGINT operations, personnel who provide SIGINT support, or personnel who use the results from SIGINT operations.