Scientist at Work | John Holcomb SAN ANTONIO — Since the war in Iraq began, Col. John Holcomb has been working to change the way the military takes care of its wounded. Along the way he has suffered a few dings himself. A tall medical doctor with a Southern lilt and close-cropped gray hair, Colonel Holcomb, 48, has spent his entire 27-year career in the Army, earning a reputation as one of the military’s top trauma surgeons. Since 2001, he has headed the Army’s Institute of Surgical Research, based on the campus of the Brooke Army Medical Center here. Under...