Ship commissioning Ship commissioning is the act or ceremony of placing a ship in active service , and may be regarded as a particular application of the general concepts and practices of project commissioning . The term is most commonly applied to the placing of a warship in active duty with its country ' s military forces . The ceremonies involved are often rooted in centuries old naval tradition . Ship naming and launching endow a ship hull with her identity , but many milestones remain before she is completed and considered ready to be designated a commissioned ship . The engineering plant , weapon and electronic systems , galley , and multitudinous other equipment required to transform the new hull into an operating and habitable warship are installed and tested . The prospective commanding officer , ship ' s officers , the petty officer s , and seamen who will form the crew report for training and intensive familiarization with their new ship . Prior to commissioning , the new ship undergoes sea trials to identify any deficiencies needing correction . The preparation and readiness time between christening - launching and commissioning may be as much as three years for a nuclear powered aircraft carrier to as brief as twenty days for a World War II landing ship . The USS " Monitor " , of American Civil War fame , was commissioned less than three weeks after launch . United States Navy . Commissioning in the early United States Navy under sail was attended by no ceremony . An officer designated to command a new ship received orders similar to those issued to Captain Thomas Truxtun in 1798 : In Truxtun ' s time , the prospective commanding officer had responsibility for overseeing construction details , outfitting the ship , and recruiting his crew . When a captain determined that his new ship was ready to take to sea , he mustered the crew on deck , read his orders , broke the national ensign and distinctive commissioning pennant , and caused the watch to be set and the first entry to be made in the log . Thus , the ship was placed in commission . Commissionings were not public affairs , and unlike christening - and - launching ceremonies , were not recorded by newspapers . The first specific reference to commissioning located in naval records is a letter of November 6 , 1863 , from Secretary of the Navy Gideon Welles to all navy yards and stations . The Secretary directed : " Hereafter the commandants of navy yards and stations will inform the Department , by special report of the date when each vessel preparing for sea service at their respective commands , is placed in commission . " Subsequently , various editions of Navy regulations mentioned the act of putting a ship in commission , but details of a commissioning ceremony were not prescribed . Through custom and usage , however , a fairly standard practice emerged , the essentials of which are outlined in current Navy regulations . Craft assigned to Naval Districts and shore bases for local use , such as harbor tugs and floating drydocks , are not usually placed in commission but are instead given an " in service " status . They do fly the national ensign , but not a commissioning pennant . In modern times , officers and crew members of a new warship are assembled on the quarterdeck or other suitable area . Formal transfer of the ship to the prospective commanding officer is done by the Chief of Naval Operations or his representative . The national anthem is played , the transferring officer reads the commissioning directive , the ensign is hoisted , and the commissioning pennant broken . The prospective commanding officer reads his orders , assumes command , and the first watch is set . Following , the sponsor is traditionally invited to give the first order to the ship ' s company : " Man our ship and bring her to life ! " In recent years , commissionings have come to be more public occasions . Most commonly assisted by a Commissioning Support Team ( CST ) , the Prospective Commanding Officer and ship ' s crew , shipbuilder executives , and senior Navy representatives come together for a formal ceremony placing the ship in active service ( in commission ) to her country . Guests , including the ship ' s sponsor , are frequently invited to attend , and a prominent individual delivers a commissioning address . On May 3 , 1975 , more than twenty thousand people witnessed the commissioning of USS " Nimitz " at Norfolk , Virginia . The carrier ' s sponsor , daughter of the late Fleet Admiral Chester Nimitz , was introduced , and the President of the United States was the principal speaker . Regardless of the type of ship , the brief but impressive commissioning ceremony completes the cycle from christening and launching to bring the ship into full status as a warship of her nation . Ship decommissioning . 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 . 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 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 " ( AGTR - 5 ) . 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 and . In addition to the economic advantages of retiring a ship that has grown maintenance intensive or obsolete , the decommissioning frees up the name used by the ship , allowing vessels currently in the planning or building stages to inherit the name of the warship in question . Often , but not always , ships that are decommissioned end up spending the next few years in a reserve fleet before their ultimate fate is decided .