Whether the biofuels industry can scale up to provide the 8 million barrels the Navy needs annually at a price Uncle Sam can afford is the big unknown.

FORBES: The U.S. Military's Great Green Gamble Spurs Biofuel Startups

We aggressively pursued the market and growth because we thought we had to get up to a certain scale to survive the shake-up in the computer industry.

FORBES: Larry Ellison

The financial industry has ramped up pressure on government officials to scale back the rule, which is set to be implemented in July.

WSJ: EU Plans Complaint on 'Volcker Rule'