章 406: Chapter 399 Unmanned Sentinel System

The Unmanned Sentinel System is not a specific system name but rather a general term for a large category of battlefield surveillance systems that use an array of technologies such as sound, light, shadow, electromagnetic, thermal imaging, and more to replace human sentinels.

Spotting an Unmanned Sentinel System generally means only that you have been exposed and discovered by the enemy who set up this system. So the best course of action would be to leave this place as quickly as possible. Why then, did Ralph call for everyone to get down?

Gao Yuan couldn't figure it out, but his moment of confusion was brief, as his body reacted faster than his brain.

It didn't matter if he couldn't understand; the first reaction should be to get down.

Moreover, as Gao Yuan hit the ground, he pressed Xinghe beneath him, then lay on top of her.