I can't say if it's only confined to your base, but I can tell you I've never seen it out of a B-1 WG/CC. Even the AUAB WG/CC often showed up to the chow hall an hour prior to the mission brief to eat with the rest of the crew. Often our WG and OG/CC are utilized as IPs and Evaluators, coming in on mission planning day (granted, they generally have alot of alibis so they don't get the full effect...but still), and they step with the rest of us, ride in the same van with the rest of us, and debrief with the rest of us.
They certainly don't require crew bios or a mission brief three days in advance. Then again, both B-1 bases are home to relatively small operations groups, so the WG and OG/CC already know most of the people in the squadron on at least a "I've seen that guy around" basis.