July 20, 2012: Air Force Staff Sgt. Luis Walker arrives for the fourth day of his trial at Lackland Air Force Base in San Antonio. Walker was accused of sexually assaulting 10 basic trainees, with charges ranging from rape and aggravated sexual assault to obstructing justice and violating rules of professional conduct. Read more: Staff Sgt. Walker found guilty on all charges of sexual misconduct Photo: Billy Calzada, Associated Press / San Antonio Express-News