USS Guide MSO-447

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 To Decommission a Ship

Is to terminate its career in service in the armed forces of a nation. Unlike wartime ship losses, in which a vessel lost to enemy action is said to be struck, decommissioning confers that the ship has reached the end of its usable life and is being retired from a given country's navy. Depending on the naval traditions of the country in question, a ceremony commemorating the decommissioning of the ship in question may take place, or the vessel may be removed administratively with little to no fanfare. The term "paid off" is alternatively used in British Commonwealth contexts, originating in the age-of-sail practice of ending an officer's commission and paying crew wages once the ship completed its voyage.

Ship decommissioning usually occurs some years after the ship was commissioned and is intended to serve as a means by which a vessel that has become too old or too obsolete can be retired with honor from the operating country's armed force. Decommissioning of the vessel may also occur due to treaty agreements (such as the Washington Naval Treaty) or for safety reasons (such as a ship's nuclear reactor and associated parts reaching the end of their service life), depending on the type of ship being decommissioned. In a limited number of cases a ship may be decommissioned if the vessel in question is judged to be damaged beyond economical repair, as was the case with USS Liberty, USS Halibut and more recently with Costa Concordia.  In very rare or extraordinary cases, a navy or its associated country may recommission or leave a ship that is old or obsolete in commission with the regular force rather than decommissioning the vessel in question due to the historical significance or public sentiment for the ship in question, as has been the case with the ships USS Constitution and HMS Victory. Vessels preserved in this manner typically do not relinquish their names to other, more modern ships that may be in the design, planning, or construction phase of the parent nation's navy.