What is not a function of radar?

The choice indicating that detecting weather patterns is not a function of radar is correct because, while radar can indeed be used to observe and track weather phenomena, its primary purpose in military context is typically focused on detecting and tracking objects rather than weather conditions.

Radars are predominantly employed for surveillance and fire control operations, which encompass tracking vessels in maritime environments, identifying potential missile threats, and collating data on enemy movements. These functions are primarily designed to enhance situational awareness and target acquisition for military operations.

While certain types of radar systems, such as Doppler radar, are specifically designed for meteorological purposes and can provide valuable weather information, the core responsibility of radar systems in military environments emphasizes object detection and tracking. The answer recognizes the specific context of military radar usage where the other functions mentioned are essential and integral.