What type of ammunition is specified to be stowed in a jettisonable locker?

The specification of storing certain types of ammunition in a jettisonable locker is primarily concerned with safety and operational protocols. Thermite grenades are designed to create severe thermal effects upon detonation, making them hazardous if an incident were to occur. Jettisonable lockers are typically used for munitions that pose a unique risk; this allows for safe disposal or removal during flight or operations without compromising the safety of the vehicle or personnel.

Choosing thermite grenades over the other options reflects the need to provide a safety mechanism for dealing with munitions that can cause significant thermal effects and potential hazards. The other types of ammunition—smoke bombs, high explosives, and practice rounds—may not have the same level of thermal risk or operational necessity to be stowed in a manner that allows for quick ejection under emergency conditions. This distinction helps ensure that the protocols for ammunition storage are aligned with the potential risks associated with each type of explosive device.