As a U.S. Army paratrooper, Robert McDonald trained to fight enemies in jungles, deserts and the Arctic. Now, going into his second year as chief executive of Procter & Gamble Co., the former military man is mounting a two-pronged attack on a very different battlefield—the global consumer-products industry.  His missions: To win back ground lost as frugal shoppers have opted for cheaper alternatives to P&G's goods, and to conquer countries now dominated by rivals like Unilever PLC and Colgate-Palmolive Co.
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