Which model of helicopter is referred to as the Sea King?

The Sea King is a model of helicopter known for its versatility and has been widely used by the U.S. Navy as well as other military branches and nations around the world. Specifically, the UH-3H variant, often called the Sea King, is recognized for its capabilities in search and rescue, anti-submarine warfare, and troop transport. It features a distinctive design with a large size and a capacity for transporting passengers and equipment, making it a vital asset in naval operations.

The other options represent different helicopter models that do not carry the "Sea King" designation. The UH-1N is a utility helicopter commonly known as the "Huey," the VH-3D is a version used primarily for transporting the President, while the TH-6B is a training helicopter for the Navy. Each of these helicopters serves its specific purpose but does not encompass the characteristics or historical significance associated with the Sea King model.