HARTFORD, Conn. ---- For Ensign Peggy LeGrand, the biggest concern about serving on a submarine is not spending weeks at a time in tight quarters with an entirely male crew. What worries her is the scrutiny that comes with breaking one of the last gender barriers in the U.S. military. "I have a feeling more people will be focused on us. Our mistakes and successes will be magnified more than they deserve," said LeGrand, 25, a Naval Academy graduate from Amarillo, Texas. LeGrand is among a small group of female officers who are training at sites including Groton, Conn., to...