The truth on noble 6
Backstory on others of NOBLE team first
Kat-b320 was not part of Operation Prometheaus(why she is alive) where some 290+ ALPHA company spartans fought and died. The ones that survived were Carter, Jun, and Emilie. This was 2537.
2545 Operation Torpedo on Pegasus Delta. B312(you as noble 6) was taken out of BETA company right before the operation that only left Tom and Lucy alive. B312 was assigned on a SOLO mission.
Now when Jorge states he didn't think there were anymore spartans that lived on Pegasus he is assuming that B312 was on Pegasus. Why? Because he is a Spartan II, and the other members of Noble team are all of ALPHA company and weren't there either. HOWEVER, when they are walking to the "choppa", Carter says he read his file and that the new noble6(b312) has to leave the "lone wolf" stuff behind. Confirming that indeed B312 was on a "lone wolf"/solo mission and that is why he is now the 3rd member of BETA to be alive. The other Spartans did not see this info and do not know. Only Carter knows the truth.