Load up “Reclaimer” on Legendary with the IWHBYD skull on Rally Point Alpha.
Once “Palmer” is done talking walk up to the marines who are saluting, the one of the left and stare at him. He will start talking.
They each say 3 lines, the one of the left will occasionally say “Hey Chief, the noob combo isn’t cheating as long as your form is right, who cares what the haters say” or something like that.
I’ve also heard “So, you’ve seen the new aliens? What’s up with the little hands… Like T-Rex hands or something, they give me bad dreams”.
It seems to vary every time but they can say some pretty funny stuff.
The noob combo one is probably the funniest IMO. This is probably old. But oh well.