>>63989066 (OP)>>63989134These are Bush era concepts which eventually sort of half informed whet ended up being Expeditionary Sea Bases(ESBs).
ESBs are Alaska Class oil tankers with the tanks chopped out and a flight deck built above. They are extreme budget aircraft carriers for supporting special ops shit in the middle of fucking nowhere. The lower deck gives you waterline access and lets you stack a huge amount of random crap so you don't constantly need to fly in supplies. The flight deck lets you operate a bunch of rotary wing aircraft, including Ospreys. The forward structure is a large enclosed hangar for the aircraft.
The design philosophy is pretty obvious if you start looking at them closely. Air defenses? No, too expensive. Military damage control standards? No, too expensive. Elevator to get stuff from the lower deck to the flight deck? No, too expensive, cut out a section of the deck and use a crane. Crew? Small and mostly civilian. It's an oil tanker with the minimum modifications needed to make it useful in some low intensity military contexts.
Why? Because you get a 80,000 ton ship which costs less than a frigate.