The Sentinel is a one-man, all-terrain, lightweight, bipedal combat walker that is used by the various regiments of the Imperial Guard. The Sentinel is most favoured when Guard patrols must move across rough terrain that would completely immobilise heavier vehicles. The Sentinel uses a robust and highly sophisticated gyro-stabiliser system that keeps the walker steady while traversing any terrain, including steep slopes and deep craters. The articulated legs of the Sentinel allow the walker to stalk quietly through urban ruins or dense undergrowth while still allowing it to achieve an impressive speed over open ground. Scout Sentinels have noise-reduction modifications applied to their power-plants to reduce the possibility of their movements being heard by the enemy. The crews of Sentinel squads will adapt their vehicles for all sorts of difficult operating environments, making use of everything from large chainsaws for cutting through dense jungles and forests to servo-claw spikes that can grip glacial planes. Sentinels are often fielded in squadrons as scouts or infantry fire support vehicles. They can carry a variety of heavy weapons and bring high levels of power and maneuverability together in one highly mobile unit. Sentinels are lightly armoured, however, and are susceptible to heavy barrages of small arms fire.