By David Alexander and Phil Stewart WASHINGTON (Reuters) - A top U.S. military official declared "the days of Rambo are over" as the Pentagon unveiled its plans on Tuesday for integrating women into combat infantry positions following 12 years of war in which they fought and died in Iraq and Afghanistan while barred from front-line fighting jobs. The plans, which call for gender-neutral job requirements like scaling walls and lifting 55-pound (25-kg) tank ammunition, will require more years of study, education and training before some services open combat jobs to women. ...