NEW YORK - The Washington Post won six Pulitzer Prizes on Monday, including the public service medal for exposing shoddy treatment of America's war wounded at Walter Reed hospital, and the breaking-news award for coverage of the Virginia Tech massacre. The New York Times received two Pulitzers: one for investigative reporting, for stories on toxic ingredients in medicine and other products imported from China, and one for explanatory reporting, for examining the ethical issues surrounding DNA testing. The Post's other awards were for: • National reporting, for its exploration of Vice President Dick Cheney's backstage influence; • International reporting, for...