In December 2005, the surface force’s leaders decided to transition from a traditional executive officer (XO) and commanding officer (CO) model of separate tours to a fleet-up model where the current XO relieves the CO on the same ship. The transition took eight years to fully implement. In my experience, the XO/CO fleet-up command model has proven to be a wise decision.
XO–CO Fleet-Up Works
By Captain Jordy Harrison, U.S. Navy