Create a new field in the GNDT called Command Role. Set it to an empty string for all players.

Add a new rule, “Command Roles”:

Some Crewmembers have a Command Role, tracked in the GNDT as a text string and defaulting to blank. No more than one Crewmember at a time may be assigned a given Command Role. A Crewmember who has a Command Role may have special Daily Actions that only they can take, or other persistent effects related to their status in the game.

The valid Command Roles are Pilot, Doctor, and Mediator.

No Crewmember may have a Command Role before the 26th of January 2015. If there is a Command Role with no Crewmember assigned to it, and there are at least two active Crewmembers with no Command Role, the Ship’s Computer may pick a random Crewmember using the GNDT DICE function (where each Command Role-free Crewmember is assigned a number in a GNDT comment before DICE is called) and assign that Command Role to the Crewmember so selected.