Sentinel Raid

The Imperial Guard uses Sentinel class walkers as a rapid response and recon units due to their high mobility, as their legs allow them to cross terrain that would be problematic for tracked vehicles. There are several variants of the Sentinel: Armored with enclosed pilot compartment (pictured, heavier front armor and can mount a Plasma Cannon in fluff), Scout (lighter, but more vulnerable), Drop (Airmobile, can be armed with a multi-melta) and Powerlifter (no weapon except for cargo claws).
Sentinel is typically armed with a single heavy weapon: multilaser, heavy flamer, autocannon or lascannon. Sentinels pictured are armed with lascannons, as all DoW Sentinels are, which turns them into excellent tank hunters.