We've been talking a lot about going green, but one group in particular stands to make an enormous impact with an eco friendly turn, the u.s. military. however, it won't be easy. barbara starr finds out what it will take on this week's eco solution. >> who guzzles the most fuel in the u.s.? it's the military. using about 300 million barrelses of oil each day to keep running its installations, ships, vehicles and fighter jets. every $10 a barrel price hike adds more than $1 billion to the defense budget. so the second of the navy, ray maybis, says for him, alternative fuels are a top priority. ...