The quick-moving Crusader robot is armed with a power sword in each arm for close combat, but a back-mounted las-cannon ensures it doesn't lack in anti-tank firepower either. Apparently they're often used for "mutant hunting", presumably because they aren't affected by fear or terror and won't be corrupted by the unnamed powers. They also make excellent fast tank-hunters.
Speedy and well-armed, they also look really cool, a good deal less static in their poses than some of the other robots and more insectoid than human in shape. I always liked the Crusader but sadly never got a full-scale version, so these little chaps will have to do instead!