What are the three levels of doctrine ranked from lowest to highest intellectual content?

The correct answer outlines the hierarchy of military doctrine in terms of their intellectual content, starting from the most foundational to the more comprehensive aspects.

"Basic" doctrine represents the fundamental principles that guide military operations and is considered the foundation upon which the other levels are built. It includes overarching guidelines that dictate how forces are organized, trained, and utilized. This level is essential for establishing a shared understanding of military operations across different branches and levels.

Following that is "Operational" doctrine, which details how military forces conduct campaigns and major operations to achieve strategic objectives. This level ties together basic principles and tactical implementation, focusing on how different units work together to accomplish goals effectively during larger conflicts.

The final level, "Tactical," is concerned with the execution of specific tasks and the methods used in individual engagements or battles. While it is crucial for success in the field, it is shaped by and relies on the broader operational and basic doctrines.

Understanding this hierarchy helps military personnel grasp how foundational principles guide overall strategy and specific actions within operations, emphasizing the structured nature of military planning and execution.