A single ship sea base. Make sure to check out ThinkDefence's take on the "original" AFSB, the Atlantic Conveyor.
This from their website...
Afloat Forward Staging BaseMSC, through the CNO’s SeaPower 21 and sea-basing initiative, is developing the concept of the afloat forward staging base to rapidly and efficiently meet the U.S. Marine Corps’ future requirements and to support joint forces’ ability to launch combat power from the sea. MSC is exploring a commercial approach to the AFSB, taking advantage of our experience with the maritime community and industry’s research and development capabilities.The proposed AFSB concept uses a 1,140-foot commercial container ship with a 140-foot beam, puts a flight deck on top to launch and recover helicopters and, potentially, short take-off and landing, fixed-wing aircraft. The ship would use modular berthing, feeding, medical and administrative spaces and would incorporate a selective cargo discharge system, automating supply selection and distribution.
