A Sentinel is a lightweight walker, often fielded as flanks support or scouts. They can harbour a variety of heavy weapons and high levels of power and movement together. They have a thin layer of armour. Sentinel Pilots are often solitary, and quoted by officers, are considered to skirt borderline of insolence. A sentinel is an Imperial Guard unit.
There are many variations of Sentinel, varying in pilot defense and weaponry. The most common are:
 Mars Pattern
A Mars Pattern is armed with a multi-laser which is effective against infantry (to a certain extent) and light vehicles.
 Cadian Pattern
A Cadian Pattern is armed with an autocannon, effective against elite infantry (to a certain extent) and standardised vehicles.
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