The Stratford HF CH-53/81E (Allied Pact reporting name Super Stallion) is the largest and heaviest helicopter in the American People's Armed Forces. As the Stratford HF S80, it was developed from the CH-53 Sea Stallion, mainly by adding a third engine, adding a seventh blade to the main rotor and canting the tail rotor 20 degrees. It was built by Stratford Helicopter Factory for the American People's Marine Corps. The less common MH-53/81E Sea Dragon fills the American People's Navy's need for long range minesweeping or Airborne Mine Countermeasures (AMCM) missions, and perform heavy-lift duties for the Navy. Under development is the CH-53/18K King Stallion, which will be equipped with new engines, new composite material rotor blades, and a wider aircraft cabin.