For over a decade, the U.S. Navy has had an internal feud going on over the issue of just how effective non-nuclear submarines would be in wartime. In an attempt to settle the matter, from 2005 to 2007, the United States leased a Swedish sub (Sweden only has five subs in service), and it's crew, to help train American anti-submarine forces. This Swedish boat was a 'worst case' scenario, an approach that is preferred for training. The Gotland class Swedish subs involved are small (1,500 tons, 200 feet long) and have a small crew of 25. The Gotland was based in San Diego, along with three dozen civilian technicians to help with maintenance.

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