More than 1,000 American troops have been wounded in battle over the past three months in Afghanistan, accounting for one-fourth of all those injured in combat since the U.S.-led invasion in 2001. The dramatic increase has filled military hospitals with more amputees and other seriously injured service members and comes as October marks the deadliest month for American troops in Afghanistan. Expanded military operations, a near-doubling of the number of troops since the beginning of the year and a Taliban offensive that has included a proliferation of roadside bombings have led to the great increase in casualties. U.S. troops in...