Five years ago, the U.S. Navy set out to find out, spending $12 million to purchase 450,000 gallons of biofuel from Tyson Foods and TerraVia, and attempting to use it to power an aircraft carrier strike group during squadron exercises near Hawaii. Dubbed the “Great Green Fleet,” the experiment was a success, but even so, at roughly $26 a gallon, the biofuel cost nearly eight times what standard F-76 naval diesel fuel cost at the time. And that raised an important question: Can the U.S. military afford to “save the planet” while paying such high prices? Luckily, it may not have to.
http://www.fool.com/investing/general/2016/05/15/can-the-us-military-afford-to-run-on-biofuels.aspx