Lt. Clint Riley (call sign "Castle") was Colonel Douglas Rooks' personal aide and trusted confidant in the NYZ operation. He had served in Blackwatch since at least the events of the first outbreak. Riley engaged in many operations, including providing protection for Gentek scientists, facilitating all NYZ military operations, and engaging in various operations to capture James Heller. All of his operations were taken on the behest of Colonel Rooks' orders.