In case anons didn't know, many military hospitals, ESPECIALLY Bethesda and Walter Reed, have classified and off limit wings and floors (usually below ERs or areas with MRI / CAT machines for shielding). I hope FLOTUS is fine, but as another anon noted, she would easily serve as a reason for POTUS to have a TS meeting under the guise of tending to his wife.
Could be. Heard "stories" about 2 others in particular that were used for incoming / transfers / debriefs in the past. One in Philly and one in St. Louis. Andrews has always been a catch all since AF1 / double are based there and is always secure for POTUS.