What term describes the action of isolating a target in military operations?

The term that describes the action of isolating a target in military operations is indeed isolating. In a military context, isolating a target involves preventing it from receiving support or reinforcements, effectively cutting it off from additional resources, and making it vulnerable to engagement or destruction. This is a critical part of many tactical operations, ensuring that an enemy or objective cannot escape or be bolstered by allies, thus increasing the likelihood of mission success.

While securing refers to taking control over an area to ensure its safety and preventing enemy access, and recon pertains to reconnaissance, which is the gathering of information about enemy positions and activities, isolating specifically emphasizes the denial of resources and support to the enemy. Controlling generally covers managing or governing an area, but may not capture the focused intent of cutting off support as isolating does. Therefore, the specific action of isolating a target is clearly the most appropriate definition in the context of military operations.