Which organization leads operational logistics professionals in sustaining the fleet?

The Military Sealift Command (MSC) is the organization responsible for leading operational logistics professionals in sustaining the fleet. MSC plays a crucial role in the Navy's logistics by providing ocean transportation and logistics support services. Their mission includes delivering supplies and equipment to Navy ships and operations, which is essential for maintaining the operational readiness of the fleet.

MSC operates a variety of vessels and engages in strategic sealift missions that ensure that the Navy can sustain long-term operations at sea, thereby supporting naval warfare and other crucial missions. This operational logistics capability is vital for the efficiency and effectiveness of naval operations.

In contrast, while other organizations like NAVSUP are also involved in logistics, they do not primarily focus on operational logistics at sea. NAVSUP provides supply chain management, procurement, and logistics support services but is not the leading authority for sustaining the fleet in the operational sense as MSC is.