During night operations, which device is used to illuminate the rescue swimmer's rescue chemical lights?

The correct device used to illuminate the rescue swimmer's rescue chemical lights during night operations is the navigational light. Navigational lights typically have a specific color coding and are designed to ensure visibility of vessels and personnel during low-light conditions, such as at night. They help in orienting both the rescuers and the rescue swimmers, allowing for better situational awareness in a dark environment.

The use of navigational lights is critical in rescue operations, particularly to prevent collisions and improve the safety of both the rescuers and those being rescued. They contribute to effective communication of positioning and status during nighttime rescues.

The other choices serve different functions but do not specifically provide the illumination needed for rescue chemical lights. Rescue strops, while important for securing swimmers during extractions, do not function to illuminate surroundings. Signal flares are used to signal distress or draw attention but do not provide a steady light for visibility in the manner required for illuminating chemical lights. Infrared lanterns are useful for undetectable illumination but are primarily used for covert operations rather than for standard visibility during rescues.