A companion to the new exhibit at the National Museum of American History, this site traces the history of submarines from their early roots to their key role in the "Strategic Triad" of nuclear forces in the Cold War. The primary focus of the site, however, is post-WWII nuclear powered submarines: fast attacks (smaller enemy sub hunters) and boomers (ballistic missile subs). Well organized with numerous illustrations, the site touches briefly on a wide range of related topics, offering a fairly comprehensive introduction to the past, present, and future of America's submarine forces.