User blog comment:Legionwrex/Warning spoilers to halo reach follow./@comment-3165670-20100915115103/@comment-730941-20100916114128

'First Strike' and 'Ghosts of Onyx' also reveal more about the survivors of Reach (though obviously they were both made before Halo: Reach).

Although, given the events of the game were somewhat different to some of the plot of Fall of Reach, it's difficult to see how much weight Bungie places on the books as being canon. Some of the 'package' storyline belonged in First Strike, but overall the events of the two (game and novel) matched up rather nicely.