reported three-month mission to the United States maritime borders. The mission was described by an Iranian admiral as a response to the ongoing presence of the United States Fifth Fleet, which is based in Bahrain, across the Persian Gulf. However, the trip to the Atlantic Ocean never happened and was called off in April 2014. See also List of Imperial Iranian Navy vessels in 1979 List of current ships of the Islamic Republic of Iran Navy Notes References (Describes Sabalan actions in 1988 from the viewpoint of a U.S. frigate operating in the Gulf.) Alvand-class frigates Ships built on the River Tyne Ships built in Barrow-in-Furness 1969 ships Frigates of Iran Vickers Iran–Iraq War naval ships of Iran Frigates of the Cold War