I remember seeing what he's talking about in a few of the very first publications detailing Noble Team earlier in the year. The class letters were used in those early publications. I haven't seen them used since though. If I get a chance, I'll try digging through the archives and find one to link. UPDATE: Ok, Halopedia has the members of Noble Team all listed with letters to indicate their respective companies here: http://halo.wikia.com/wiki/Noble_Team As far as official things from Bungie, all I could find was this instruction to deduce their companies from their ages: http://www.bungie.net/News/content.aspx?type=topnews&link=BWU_012910 My guess is the good fans at Halopedia did just that, though I still could swear that I saw some other publications using the letter designations earlier... Hope that helps. [Edited on 08.23.2010 9:39 PM PDT]