WASHINGTON - Uncle Sam wants YOU, that famous Army recruiting poster says. But does he really? Not if you're a Ritalin-taking, overweight, Generation Y couch potato - or some combination of the above. As for that fashionable "body art" that the military still calls a tattoo, having one is grounds for rejection, too. With U.S. casualties rising in wars overseas and more opportunities in the civilian work force from an improved U.S. economy, many young people are shunning a career in the armed forces. But recruiting is still a two-way street - and the military, too, doesn't want most people...