Which operation is focused on detecting and destroying enemy air forces that penetrate friendly airspace?

The operation that is focused on detecting and destroying enemy air forces that penetrate friendly airspace is Defensive Counter Air (DCA). This function is a crucial aspect of air defense strategy, aimed primarily at safeguarding friendly forces and assets by engaging enemy aircraft that pose a threat. DCA involves a combination of detection, interception, and engagement of hostile air threats to ensure control of the airspace.

DCA operations leverage various systems, including radar and fighter aircraft, to monitor and respond to incursions into friendly airspace, ensuring that enemy air forces do not achieve their objectives against friendly targets. This proactive approach is essential for maintaining air superiority and protecting ground forces and critical infrastructure.

In contrast, other options like Offensive Counter Air (OCA) pertain to targeting enemy air capabilities before they can launch attacks, setting a theatre for air dominance rather than responding to intrusions. Various communication systems, such as JTIDS and Tactical Chat, support operations but do not encompass the primary objective of engaging hostile aircraft directly. Thus, DCA is distinctly characterized by its focus on defense against aerial threats that have already penetrated friendly airspace.