MOSUL, Iraq -- Jennifer Guay went to war to be a grunt. And the 170-pound former bartender from Leeds, Maine, with cropped red hair and a penchant for the bench press, has come pretty close. It was mid-February and Guay, 26, an Army specialist who was the first woman to be assigned as an infantry combat medic, was spending 10 hours a day on missions with the 82nd Airborne Division, dodging rockets and grenades in the crowded streets of Mosul. "Break-break-break: U.S. soldier down!" a hard-edged voice came over the radio. A gun battle had just broken out. In less...