Sergeant First Class Hector Lucian Williams (United States Army, callsign: Hammerhead) was a fictional character on the CBS television series The Unit. He was portrayed by Canadian actor Demore Barnes. In Season 3, Hector met a woman named Annie at a local bar. She was a waitress and former US Army medic who happened to know Tiffany. They went on a date and then shortly thereafter (with some encouragement from the other Unit women) met up at a local motel in a nearby town. While there, Hector discovered Tiffy and Colonel Ryan having an affair.