A specialized breifing room...one with art that looks like you are in a breifing room...one that folks ask permission to enter if not a squadmate, that has a map feature that you can post the mission on and everyone can see the waypoints and target. Maps could be brought up, zoomed in, show individual target bldgs.
Even have 40s era music until the briefing officer mutes it for the meeting. This would be the place to meet at the start of squad nights, instead of everyone spread all over the place. There just doesnt seem like there is a cozy nook to settle in as it is now.