What does it indicate when a commander designates a location on a map for an enemy reserve unit?

Designating a location on a map for an enemy reserve unit is indicative of establishing a commander's critical information requirement (CCIR). This practice is essential in military operations as it highlights the need for timely and relevant information about the enemy's capabilities and intentions. When a commander identifies such a location, it reflects an understanding of the battlefield dynamics and the need to monitor the enemy's reserves closely. This designation allows for focused intelligence gathering and enhances situational awareness, ultimately aiding decision-making processes.

This action is crucial for maintaining operational effectiveness, as it ensures that commanders prioritize information that could impact their mission, such as enemy troop movements or unit composition. By identifying a reserve location, the commander is signaling that understanding the enemy’s positioning and strength is vital to the operation's success, allowing for more strategic planning and response options.