The U.S. government's $2.65 billion operating loan program to help farmers keep their businesses going has already run out of cash, as requests for federal financial assistance grow amid the worst agricultural downturn in more than a decade. As a result, the U.S. Department of Agriculture is looking for other money sources "to help bridge the gap in farm operating loans as much as possible until additional funds are made available, either this year or in the next fiscal year," the agency said. The agency declined to say what other funding it was hoping to leverage for assistance. Such FSA loan guarantees and direct loans are often considered to be loans of last resort, say banking experts. Without the financial support, some farmers may struggle to survive until the next cash injection in the fall, say rural economy experts.