I can't remember them ever mentioning it, though they must have. Master Chief had the number 117 I'm sure. I can't remeber Kellys, but that at least they must have mentioned. Linda was Blue One. More than that is a blur...
I couldn't find any real connections between Halo and Marathon. Though they did mention "the normal Marathon class ships" or something like that when they compared ships once in the book. The MJOLNIR suit also sounds familiar almost like from a dream or something. The Spartans had strenghthened bones and could survive long falls...
: I think FoR make it clear there's no connection between Marathon and Halo.
: I'm re-reading it now, and it's really fun to enter that deep in a game's
: story. One thing I missed, what's Linda's Spartan number?
: Djof
: "Je me souviens"