Command
Command is the department that is made up of the heads of each department, who in turn are responsible for their respective departments.
Members
Captain

The captain is the highest ranking member on station barring Central Command making an appearance. As such, that gives them authority over the station's going ons as well as a target on their back in a large number of game modes. As the captain, you should remember to stay active on station, watching over departments, other heads and potentially filling in certain positions depending on circumstance (do not exped, you will be bwoinked). It's very important to remember that despite the whole station answering to you, you don't have absolute authority, IE if you tell the CE to set up the singularity, they could refuse under the premise that they have a realistic reason to believe someone will attempt to sabotage it (singulo beacon being found, war ops being called, etc). All access does not mean all powerful, don't be a shitter.
Head of Personnel

The Head of Personnel (HoP) is the head of the service department.
hi kuafu
Head of Security

The Head of Security, aka the HoS, is, as the name implies, the head of the security department.
the hos
Chief Medical Officer

The Chief Medical Officer (CMO) is the head of the medical department.
the cmo
Chief Engineer

The Chief Engineer, often referred to as the CE, is the head of the engineering department.
hi roomba
Quartermaster

The Quartermaster, frequently the QM, is the head of the supply department.
hi deli
Research Director

The Research Director (RD) is the head of the science department.
hi iris