Matt Pottinger was a reporter, but he's no longer so sure that the pen is mightier than the sword. The 32-year-old former Wall Street Journal reporter has joined the U.S. Marines. "The life of a reporter versus the life of someone in the military -- it is a radical departure," he mused. Combination of Factors In seven years covering China for The Wall Street Journal, Pottinger got a sense of how American liberties are a rarity in the world -- especially when he got arrested for writing about corruption. "I was standing over a toilet," he recalled, "with a bunch...