The Command department is ultimately responsible for the ship and its crew, and those within the department are responsible for commanding the vessel and representing the interests of Starfleet.

The operations department is responsible for keeping ship systems functioning properly, rerouting power, bypassing relays, and doing whatever else is necessary to keep the ship operating at peak efficiency.

From sensor readings to figuring out a way to enter the strange spatial anomaly, the science department is responsible for recording data, testing new ideas out, and making new discoveries.

Merging the responsibilities of ship-to-ship and personnel combat into a single department, the tactical department is responsible for the tactical readiness of the vessel and the security of the ship.

The engineering department has the enormous task of keeping the ship working; they are responsible for making repairs, fixing problems, and making sure that the ship is ready for anything.

The medical & counseling department is responsible for the mental and physical health of the crew, from running annual physicals to combatting a strange plague that is afflicting the crew to helping a crew member deal with the loss of a loved one.