Habitat Commander
From OCE Space Simulation
Astronaut Commander is the title that is given to the Mission Commander in charge of the Astronauts. This Commander will participate in the mission from within the Habitat.
History
This position was known as the Habitat Commander prior to ... and is sometimes still referred to as Habitat Commander.
Historically, the Astronaut Commander produced the Astronaut shift schedules, and was in charge of the astronauts through the mission. Any mission critical decisions to be made when Mission Control could not be contacted were done by the Habitat Commander.