Operation control (OPCON) is the authority to perform command functions over subordinate forces involving ________ and ________ commands.

Operation control (OPCON) refers to the authority granted to a commander to direct forces within the framework of performing command functions. The correct answer highlights that OPCON encompasses the ability to give detailed direction and control over subordinate forces, which is a fundamental aspect of military command structure. This means that under OPCON, a commander can dictate how forces are to operate within a specific mission or action, allowing for flexibility and detailed planning to achieve operational objectives.

This understanding of OPCON is critical for effective military operations, as it allows for centralized command while still permitting the subordinate units the autonomy to execute their assigned tasks. It emphasizes the importance of coordination and synchronization across different units to ensure mission success.

The other options do not capture the specific nature of the authority associated with OPCON. For example, while strategic and tactical, operational and command, and general and specific choices pertain to broader concepts in military command, they do not directly relate to the detailed, directive nature inherent to OPCON as defined in military doctrine. This distinction makes the correct answer specifically relevant to the nuances of military operational control.