Marine Corps Tactical Publication 3-30A, Command and Staff Action, provides staff tactics, techniques, and procedures that support the commander's decision making process at all levels of command. This publication consists of two parts. Part I describes command and staff organizations; the MAGTF command structure, to include the commander's personal, general, and special staffs; and billets within each functional organization as they relate to the commander and identifies these roles and responsibilities. Part II identifies key coordination measures or staff actions necessary to aid the commander in decision making and reinforces key means of communications via standardized reports and information management systems and processes. MCTP 3-30A applies to major subordinate commands, regiment/group, and battalion/squadron levels. Any Marine at any echelon can reference this publication to understand basic command and staff actions.