ss challenged the U.S. military???which accounts for 80% of the government's energy consumption???to draw 25% of its energy from renewable resources by 2025.6 Then in 2009, President Obama mandated that all Federal agencies, including the Department of Defense, use 30% less petroleum in its vehicle fleets by 2020.7 In the spring of 2010, the Navy adopted a set of even more ambitious goals, includi