Defense Secretary Robert Gates, who leaves office at the end of the month, sharply criticized NATO Friday. He noted that all members of the alliance voted for the Libya mission, but less than half have participated. Just 11 weeks into the mission, the "mightiest military alliance in history" is beginning to run short of munitions, requiring the U.S. once more to make up the difference. The U.S. is "in the midst of a deep economic crisis of our own," he said. "If you told American taxpayers, as I just did, that they're bearing 75 percent of the financial burden of the alliance, this going to raise eyebrows."