When selecting an RSO for a MK-19 grenade launcher exercise, which factor must be considered?

When selecting a Range Safety Officer (RSO) for a MK-19 grenade launcher exercise, the type of weapon being used is a critical factor to consider. The MK-19 is a crew-served, fully automatic grenade launcher that operates differently from other weapons systems. It requires specific knowledge and expertise regarding its operation, safety protocols, and handling characteristics.

The RSO must be thoroughly familiar with the MK-19's operational procedures, including its range, ammunition types, and the unique risks associated with its use. Understanding these factors is vital for ensuring that safety standards are maintained and that all personnel involved in the exercise know how to respond in case of an emergency.

While the time of day, weight of the ammunition, and location of the exercise are important considerations in the broader context of range safety and operations, they do not directly address the specific requirements for safely overseeing operations involving the MK-19 grenade launcher. Therefore, the type of weapon being used takes precedence in the selection of an appropriate RSO.