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A first officer, also known as an executive officer or XO, was the officer second-in-command of an establishment or unit, ranking right below the commanding officer. In Starfleet, the first officer normally held the rank of lieutenant commander or commander.

Duties a Starfleet first officer might be expected to perform include:

  • Advising the commanding officer
  • Implementing the commanding officer's orders
  • Preparing and issuing duty rosters
  • Commanding the starship, starbase or other establishment in the commanding officer's absence or inability to do so
  • Evaluating crewmembers aboard the starship, starbase or other establishment with the chief medical officer's and / or counselor's assistance.

By the 24th century, Starfleet first officers usually led away teams while the commanding officer stayed aboard the starship.

Notable first officers

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