Pfc. Sam Huff decided at age 16 she would enlist in the Army. On Monday she was killed when a roadside bomb detonated next to her Humvee in Baghdad. Eighteen-year-old Pfc. Sam Huff was born with a man's name. But she was a consummate "girlie-girl," said her father, Robert Huff. She liked to wear false eyelashes and played flute in her high-school band. Last July, she joined the Army, the first step in a career she hoped would take her to the FBI. On April 18, Huff, an only child, became the 37th U.S. female to die in combat since...