Since 1946, the US government has maintained fleets of various "mothballed" ships that can be readied and used in case of a crisis.
These boats, some of which are very old, include military ships that served in World War II, the Korean War, the Vietnam War, and Desert Storm, as well as civilian merchant ships from previous decades. The fleets sit, mostly untouched and off-limits, in the coastal waters of California, Texas, and Mississippi as well as North Carolina and New Jersey.
Story and more pictures @ Go aboard a fleet of military ghost ships decaying off the coast of San Francisco#