This manual, Marine Corps Tactical Publication MCTP 3-01B Air Assault Operations February 2019, describes how infantry and aviation units plan and conduct air assault operations. MCTP 3-01B emphasizes the coordination necessary between ground, air, combat support, and combat service support organizations concerning the planning sequence and tactical employment of ground and aviation elements. It describes the versatility of air assault operations and explains the tactical fundamentals of air assault operations for ground-based operations once ashore. MCTP 3-01B is intended for commanders, staff officers, and support units responsible for the planning and execution of air assault operations. However, it should be read by any Marine involved in the execution of air assault operations.