Marine Corps Reference Publication (MCRP) 2-lOA.9, Air Intelligence, is the first Marine Corps doctrinal publication dedicated entirely to intelligence support to the Marine Air-Ground Task Force's (MAGTF) Aviation Combat Element (ACE). This publication builds upon the doctrinal foundations established in Marine Corps Doctrinal Publication (MCDP) 2, Intelligence, and Marine Corps Warfighting Publication (MCWP) 3-20, Aviation Operations. It provides tactics, techniques, and procedures (TTP) for air intelligence in support of the ACE and the MAGTF. This publication describes the unique aspects of intelligence support to the ACE and MAGTF relating to the enemy, weather, and terrain impacting the air domain. It includes doctrinal and scientific fundamentals, multidiscipline intelligence support to the ACE, frameworks for analyzing and understanding enemy air and air defense systems, and guidance on supporting the ACE and MAGTF commander's planning, decision-making, execution, and assessments cycle. This publication sets the foundation for training requirements, formal schools, organizational structure, and, most importantly, how we provide intelligence support to the ACE and MAGTF in combat. As such, it represents only a starting point and must be continually updated as the state of the art changes. Its users must continue to validate its contents and make recommended changes when more effective techniques or processes are developed. This publication is not meant to be read alone. Its readers must bookend it on their shelves with Marine aviation doctrinal publications on one side and Marine intelligence doctrinal publications on the other. Intelligence Marines outside the ACE must use this publication to understand how air intelligence can be integrated into their operations. Air intelligence Marines within the ACE must read other MAGTF publications to ensure they are leveraging the full range ofMAGTF intelligence capabilities and the Marine Corps Intelligence, Surveill