Final answer:
When 'danger close' is called in a fire mission, additional information must be passed to the attacking aircraft, including the location of friendly forces, target details, desired effects, and identification methods, plus rules of engagement to minimize risks in uncertain and dangerous situations.
Step-by-step explanation:
When "danger close" has been announced in an Aviation/SOF gunship call for fire, it indicates that friendly forces are within close proximity to the target area, typically within 600 meters for artillery and even less for air-delivered munitions. Because of the high risk of fratricide, additional information must be passed to the attacking aircraft to ensure the accuracy and safety of the strike. This includes the precise location of friendly forces, a detailed description of the target, the desired effects on the target, and a clear method of identification of friendly forces, such as by using infrared strobes or other signaling devices. Additionally, the attacking aircraft needs a brief on the rules of engagement, to know what constitutes a legitimate target, especially under such uncertainty and potential for extreme physical danger. This information is critical to minimize the risk to friendly forces while effectively engaging the target.