completing his quest the good way results in his reenlisting with 1st Recon (NCR victory), or staying in New Vegas (Independent or House), emphasis on "good" because of all companion quests, it has the most dichotomous choices in terms of their wellbeing at the end of it, which for Boone come down to either helping him overcome internal strife or letting him succumb to it, with Veronica's coming in 2nd