Rebel Ship is an NPC, an officer onboard the main Rebel ship after the retreat of Hoth, who handles communication.
The Enemy Let Slip Edit
The Falcon reached the Rebel fleet at the rendezvous point. The Rebel Ship radioed them asking them where they'd been, that they'd been waiting for months and were almost out of hummus. Princess apologized, saying they got a bit caught up. 3PO, R2, Princess, and Luke boarded the main Rebel ship and requested a new hand be made for Luke.