What is the first rule for the Call For Fire (COF)?

The first rule for the Call For Fire (COF) is to transmit a Position Report (POSREP). This is essential because a position report provides the necessary situational awareness about the location of the observer and the target area, ensuring that all parties involved in the fire mission are operating with a clear understanding of their locations.

Starting with a POSREP also helps to establish communication effectively and allows for the proper coordination between ground and air assets, especially in dynamic combat environments. By clearly transmitting the observer's position and any relevant information, it sets the stage for the subsequent steps in the Call For Fire sequence, such as target description and method of engagement.