What is the primary use of the MK-13 flare?

The primary use of the MK-13 flare is to signal for rescue during both day and night. This flare is designed to produce a bright and noticeable signal that can be seen from a significant distance, making it an effective tool for indicating distress and drawing attention to the location of individuals in need of assistance. The MK-13 emits a bright light and produces signals that are visible even in daylight, which enhances its effectiveness in various operating conditions.

While the flare can also serve to illuminate dark areas and can attract attention during the day, its main purpose as a rescue signaling device is what sets it apart, particularly because it is engineered for maximum visibility and effectiveness in emergency situations regardless of the time of day. The option regarding storing emergency supplies is unrelated as it does not pertain to the function of the MK-13 flare at all, further emphasizing its dedicated role in signaling a need for help.