User blog comment:IceFireWarden0/Speculations for Season 11/@comment-31.147.44.74-20130515195406/@comment-4616231-20130515203532

They went to Halo: Reach because that was Church's little "memory world". He got out of that at the end of Season 9, so of course they went back to 3. That's where Church was before he went in, so it's where he was when he came out.