Which rounds utilize black keys in their operation?

The use of black keys in the operation of artillery rounds is specifically associated with advanced projectile systems like the Excalibur and Precision Guidance Kit (PGK). These rounds are designed for precision strikes and utilize sophisticated guidance systems that enhance their accuracy and efficacy on the battlefield.

Black keys typically represent a specific coding or identification that permits particular operational functions. In the context of the Excalibur and PGK, these systems require the input from black keys to enable their advanced capabilities, such as GPS guidance and precision airburst options. This allows for a significant reduction in collateral damage while maintaining the lethality required for modern engagements.

In contrast, standard high-explosive rounds, smoke, and illumination rounds do not employ the same level of technological complexity and therefore do not utilize black keys for their operation. Standard high-explosive rounds are designed for delivering explosive force rather than precision targeting, while smoke and illumination rounds serve different tactical purposes and do not incorporate the precision guidance features that necessitate the use of black keys.