A reserve fleet is a collection of naval vessels of all types that are fully equipped for service but are not currently needed; they are partially or fully decommissioned. A reserve fleet is informally said to be "in mothballs" or " mothballed". In earlier times, especially in British usage, the ships were said to be "laid up in ordinary".
A reserve fleet may be colloquially referred to as a " ghost fleet". In the 21st century, ghost fleet may also refer to an active shadow fleet of aged reserve fleet Oil tanker returned to an active service in order to circumvent commodities sanctions.
When a ship is placed into reserve status, the various parts and weapon systems that the ship uses are also placed in a storage facility, so that if the warship is reactivated, the proper spare parts and ammunition are available. Like the ships, however, the stored parts and equipment are prone to fall into disrepair, suffer metal corrosion, and become obsolete.
The United States National Defense Reserve Fleet (NDRF), consisted of about fifty World War II ships that were moored in Suisun Bay (Suisun Bay Reserve Fleet) near San Francisco since the 1950s or '60s. The fleet included military , and tankers. As of mid-2021 there are just two ships anchored in that area. Additional NDRF vessels are moored at the fleet sites at Newport News, Virginia (James River Reserve Fleet); Beaumont, Texas (Beaumont Reserve Fleet); and at designated outported berths.
Alternatives to reserve fleets include exporting the vessels for shipbreaking, or dismantling. US Toxic 'ghost fleet' not wanted in the UK, Greenpeace International website (November 5, 2003) accessed at [1] June 20, 2006 More recently, the U.S. Navy has established a program to allow ships, such as Oriskany, to be sunk in selected locations to create artificial reefs.
Recycling is another option, as in the case of the United States National Defense Reserve Fleet (NDRF), the ships of which are set to be stripped of their paint, cut into pieces, and then recycled.
Steel from pre-nuclear age ships either mothballed or sunk and raised, called low-background steel, is used in experimental physics when the experiment requires shielding material which is itself only extremely weakly radioactive, emitting less than present-day background radiation; materials which were manufactured after atmospheric nuclear explosions had taken place reflect the higher ambient level of radioactivity that fallout has caused.
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