This manual (ATTP 3-18.12) describes how brigade combat teams (BCTs) and combat aviation brigades (CABs) plan, prepare, and conduct air assault operations. It emphasizes the coordination necessary between these organizations in regards to the planning, preparation, and tactical employment of both elements. The target audience for this manual is commanders; leaders; and staffs at brigade, battalion, and company level. However, this manual applies to other organizations that are required to plan and operate as part of an air assault task force (AATF). This manual provides these leaders with descriptive guidance on how units plan, prepare, and execute tactical level air assault operations within offense, defense, stability, and civil support operations. This manual applies to the Active Army, the Army National Guard/Army National Guard of the United States, and the U.S. Army Reserves unless otherwise stated. The proponent for this publication is the U.S. Army Training and Doctrine Command. The preparing agency is the U.S. Army Maneuver Center of Excellence (MCoE).