List of changes in Halo: The Fall of Reach rereleases
From Halopedia, the Halo wiki
Halo: The Fall of Reach was first published in 2001, and since then has been adapted multiple times in different formats. Changes to the novels include grammatical fixes, resolved inconsistencies, and new bonus content. Changes in graphic media include modified, omitted, or added dialog and scenes; amalgamated character roles; and visual depictions varying from their original descriptions.
2010 Tor Books rerelease
2011 Definitive Edition rerelease
Halo: Fall of Reach comic series
Fall of Reach animated adaptation
The animated adaptation, like the comic series before it, features several changes, some of which are necessitated by the medium. The greatest change is that, in order to keep the length of the series to approximately one hour, this adaptation only covers the first half of the story ("Reveille" and "Boot" in the novel; "Bootcamp" and the first two issues of "Covenant" in the comics). This is also because that the animated series was released alongside Halo 5: Guardians and serves to introduce to the Blue Team roster featured in the game (John-117, Fred-104, Kelly-087, and Linda-058), whereas the novel and comic adaptation serve as prequels to Halo: Combat Evolved. Due to their overwhelming number, simple omissions or truncations are not listed below. Changes which are in keeping with one previous incarnation of the story but not the other are listed as such.