What does the term "danger close" mean in CFF?

The term "danger close" in the context of Call for Fire (CFF) specifically refers to situations where artillery or air support is delivered in close proximity to friendly forces, indicating a high risk of collateral damage. This term is used to delineate a threshold where the danger of friendly casualties is significant enough that additional caution and communication are warranted.

When a fire mission is deemed to be "danger close," it necessitates that all involved parties are acutely aware of the location of friendly forces, and it emphasizes the need for precise targeting and timing. This concept underlines the necessity for coordination between the calling unit and the firing unit to minimize the risk of friendly fire incidents while effectively engaging enemy targets.

The other options do not accurately capture the specific meaning of "danger close." While high priority fire missions and immediate air support are important concepts in CFF, they do not convey the critical aspect of proximity to friendly units inherent in the term "danger close." Similarly, uncertain coordinates due to poor visibility relates to challenges in targeting rather than direct risks associated with friendly forces being nearby. Therefore, the explanation of "danger close" is fundamentally linked to the calculation and consideration of safety when engaging targets close to allied personnel.