-Atlas was not involved with the Battle of Reach, he was busy with some business on Tribute when the invasion began and had no time to rally to SWORD Base, Tribute itself was also engaged in an I invasion itself.

-Atlas was once somehow transported to the 40k universe to deal with a divorce case between an Aquillian Shield and a Guardsman, unfortunately Atlas was too busy with the lawbook and the...blood games activities the @adeptusbananas.bsky.social ""volunteered"" him for to actually serve as lawyer.