Corrupted Crewman

 are Orokin-controlled Corpus Crewmen. They have exactly the same traits as standard Crewmen except that they are weak against Armor Piercing damage and use Grineer Trooper's Strun shotgun that fires a single (or very highly clustered) shot towards you, with a small amount of travel time. Although they look like a normal Corpus Crewman, their armor is the same as a normal Grineer Lancer as their whole armor has a slight armor strength that ignores some bullet damage.