But the last two you weren’t alone. You were literally trying to save keys and make it to a ship for extraction.
It was you n purple hologram lady fighting Covenant/Flood solo with zero backup.
there was no ship for extraction. There was no comms with the rest of the UNSC forces to help you on the rescue mission.
after you rip out Keyes implants for the Pillar of Autumns codes, Cortana follows up with, “We need to get back to the Pillar of Autumn. Lets go back to the shuttle bay and find a ride.” Then you take a banshee to get back to the PoA crash site.
Both levels were also reused from the beginning, you can see the change in atmosphere/tone playing them back to back
Go play Pillar of Autumn, then play The Maw.
go play Truth and Rec, then play Keyes.
the only point of UNSC contact you have for the last 4 levels infected Keyes(who isnt even with you, n who is dead by the time you reach him), then a radio evac request to Foehammer during the final warthog run. She never makes it to you, you have to carry along solo as you been doin the last several levels.