Under clear skies and with calm seas, they came by the hundreds of thousands to San Francisco Fleet Week 2010, the largest such gathering in more than twenty years to take place in the City. The USS Makin Island -- known as the Navy's "Green Ship" for its revolutionary hybrid technology came to San Francisco early to showcase its disaster relief capabilities. In addition, five more 3rd Fleet United States Navy ships, plus two from the Canadian Navy, the US Coast Guard Cutter Active and two historic vessels of WWII and Vietnam era vintage made up the annual Parade of Ships. Over the three day weekend, an estimated 1.5 million visitors thronged to the City with more than 24,000 going onboard the ships berthed for tours.