In military aircraft, why are tanker lights crucial?

Tanker lights are essential for providing visual references during refueling operations, particularly in low-light or nighttime conditions. These lights help both the tanker and receiver aircraft maintain proper positioning and ensure safe alignment during the complex process of aerial refueling. The brightness and placement of the lights allow pilots to visually gauge their distance and angle relative to each other, ensuring that the connection is made smoothly and safely without excessive risk of collision. Hence, the primary function of tanker lights is to facilitate safe and effective refueling maneuvers by improving situational awareness and communication for the crew involved.