Sentinel is an infantry unit, available in the Digital Age, being the next infantry unit after the Marine. Sentinels are the first Ranged Infantry which wields laser weapons, and wear a science fictional white uniforms and a full white helmet, with black boots. The uniform arms and tip of the helmet are colored as the player colour.
This unit is quite effective agaisnt Citizens and other infantry, but inneffective agaisnt tanks, cybers and helicopters. Even if they're weak alone, they're quite brutal in numbers, better in the company of Gladiator Tanks. They are more like underground terrorist.