Executive officer

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The executive officer (or XO) is a billet position in the armed forces. They are considered command positions, and is always the officer that is junior to the commanding officer.

UNSC Navy[edit]

In the UNSC Navy, the executive officer (or First officer) is the senior most crew member below the commanding officer of the ship. Usually, this post will be held by a Commander or Lieutenant Commander, but occasionally will be held by a Lieutenant.

UNSC Army and Marine Corps[edit]

In the UNSC Army and Marine Corps, the executive officer is the officer that is second-in-command to the commanding officer. Executive officer billets exist from the company level up, in both the Army and Marine Corps.

Note that platoons do not have XOs; the second-in-command in a platoon is a platoon sergeant.

Known executive officers[edit]


  1. ^ Halo: The Flood, Chapter 3, page 91 (2003 paperback); page 102 (2010 paperback)
  2. ^ Halo: Ghosts of Onyx, page 185
  3. ^ Halo: Ghosts of Onyx, page 187
  4. ^ Halo: Evolutions - Essential Tales of the Halo Universe
  5. ^ Halo: The Thursday War, page 48
  6. ^ Halo: Escalation, Issue #2
  7. ^ Halo: Escalation, Issue #5