As part of the contract between General Dynamics NASSCO and the U.S. Navy to build two Expeditionary Transfer Docks (formerly known as Mobile Landing Platforms), the U.S. Navy added a third ship to be constructed and configured as an Expeditionary Sea Base (ESB), or formerly known as an Afloat Forward Staging Base. A fourth ESB has been added to the original contract, and long lead time material for a fifth ESB has been awarded to NASSCO.
- USNS Lewis B. Puller (ESB 3): Delivered
- USNS Hershel Williams (ESB 4): Under Construction
- ESB 5: Under Construction
Download: Fact Sheet – Expeditionary Sea Base