Which assembly is NOT part of the MK20's major components?

The weight belt is not considered a major component of the MK20 diving system. The MK20 is designed with specific components that are essential for the functionality and safety of the surface-supplied diving operations. Among its major components are the communication assembly, harness assembly, and full face mask.

The communication assembly is crucial for ensuring that divers can effectively communicate with topside personnel during dives, enhancing safety and coordination. The harness assembly is designed to support and secure the diver, allowing for mobility and stability while underwater. The full face mask is vital as it not only provides the diver with a clear view but also integrates with the communication system and facilitates breathing.

While weight belts are commonly used in diving to provide additional weight for neutral buoyancy, they are not a specific component of the MK20’s system design, which focuses on integrated and specialized components for surface-supplied diving operations.