What is the primary reason the AN-MK13 Mod 0 signal can be handheld while burning?

The primary reason the AN-MK13 Mod 0 signal can be handheld while burning is that it is designed for use by individuals who may need to signal for help in situations where launching a flare might not be practical, such as in a survival scenario at sea. Allowing a downed pilot to hold the flare while treading water ensures that they can effectively communicate their location without requiring additional equipment or a stable platform, which may not be available in emergency conditions.

This capability is essential for survival situations where quick signaling can increase the chances of rescue, demonstrating the design's emphasis on user safety and accessibility in critical moments. The handheld feature enhances the flare's utility in emergency scenarios where the individual needs to maintain mobility or may be in turbulent water, making it a crucial aspect of the device's functionality.