Anchors Aweigh

The Navy has a program, launched in fall 2009 and called the "Great Green Fleet," to convert 50 percent of its energy to fossil fuel alternatives by 2020 and to have half of the Navy's thousands of bases become net energy zero consumers. It's a reference to the "Great White Fleet," the nickname used under President Theodore Roosevelt for a battle fleet which circled the globe almost 100 years ago.

"Every time we make changes to improve the efficiencies of our engines or systems or we use alternative sources of power, we get better and we make people safer," Mabus said.