: It was based on Bungie design documents, btu I'm sure
: there were gaps Gene Seabolt had to fill in.
And it was edited and playtested by Bungie after being written.
The only real reason *not* to take it as gospel is that it has a number of obvious, undisputable errors (like spelling, and descriptions of each unit's abilities.) Most of these are relatively minor, and I don't think they detract from GURPS' validity as a whole, but for some people they indicate that the entire thing is untrustworthy.
--SiliconDream