Berthing barge. Used when the ship is inhabitable. Has crew berths and gallery for chow.
Been a long day…….please forgive spelling.
Give you an idea of what the barge is used for. Quite common to see alongside or close to a ship during extended overhaul or when working on crews quarters.
Halter Marine Launches US Navy Berthing Barge
Link:
https://www.marinelink.com/news/halter-marine-launches-us-navy-berthing-479985