 Fuel energy can be used as a weapon. And what I wanted to do was make sure that weapon could not be used against us. So in 2009, I came up with energy goals for the Navy, the broadest of which was that by no later than 2020, at least half of all naval energy afloat and ashore will come from non-fossil fuel sources. Now, the Great Green Fleet is part of that. It demonstrated the Great Green Fleet in 2012 at Rim of the Pacific, the biggest naval exercise in the world. That showed that our ships, our aircraft, could sail, could steam, could fly on blends of normal aviation gas or marine diesel and biofuels. What we're doing now is making that part of the new normal.