Multi-mission hybrid platforms designed as flexible sea bases for launching military operations. One of the largest and highest-paying ships in the MSC fleet with a unique dual command structure.
Military Sealift Command operates the Lewis B. Puller class Expeditionary Sea Base (ESB) as a hybrid ship. While MSC operates the ship and is responsible for the physical ship, there will also be uniformed military personnel on board conducting operations. The exact makeup of the ESB crew will depend on the specific mission and current tasking.
ESBs are one of the larger vessels in the MSC fleet, and they have a unique and distinctive shape. ESBs are very tall and have almost 100 feet of freeboard from the mission deck to the flight deck.
The Lewis B. Puller class was originally supposed to be designated as USNS vessels; however, after they were introduced, they were changed to a USS designation.
USNS stands for United States Naval Ship—designated for non-combatant operations and operated by civilians. Most MSC vessels are USNS.
USS stands for United States Ship—used for combatant operations and directly owned/operated by the U.S. Navy. ESBs are able to launch offensive operations.
Licensed MSC Captain responsible for the physical operation and safety of the ship.
Military chain of command includes a Navy CO who has significant power over the vessel and can play a big role in crew morale.
There is a delicate leadership balance between the MSC Captain and Navy CO. This balance directly impacts crew morale.
Designed as a special missions ship, ESBs have a variety of military personnel on board including Special Operations Forces, pilots, and other entities. The operations they conduct depend on the military forces on board.
Acts as a flexible base of operations to launch a variety of missions
4 landing spots on flight deck, multiple helicopters in hangar
Davits capable of launching small boats for various missions
Hybrid Model: MSC CIVMARs handle the physical operation and maintenance of the ship, while Navy personnel conduct mission-specific operations.
These ships are large and uniquely designed. As a result, they rock and roll a lot. If you get seasick easily, this may not be the platform for you.
Some MSC mariners dislike hybrid crew ships due to the required working relationship with the Navy.
As a general rule, the Navy and Navy personnel will always be credited for the work/mission despite MSC mariners playing a large role. If you're looking for recognition and status, it probably won't come. Many mariners are happy to count their money and move along.
Information compiled from MSC sources and mariner experiences. Details may vary by vessel and operational status.
