
Female graduates of the Air Force's basic-training program march during ceremonies at Lackland Air Force Base in San Antonio on Friday, June 22, 2012, in an image made from video. (AP Photo/John L. Mone)

Female graduates of the Air Force's basic-training program march during ceremonies at Lackland Air Force Base in San Antonio on Friday, June 22, 2012, in an image made from video. (AP Photo/John L. Mone)

Col. Deborah Liddick will lead the Air Force's basic-training unit at Lackland Air Force Base in San Antonio, where dozens of female recruits have alleged they were sexually assaulted or harassed by male instructors within the past year. (AP Photo/U.S. Air Force)

Col. Deborah Liddick will lead the Air Force's basic-training unit at Lackland Air Force Base in San Antonio, where dozens of female recruits have alleged they were sexually assaulted or harassed by male instructors within the past year. (AP Photo/U.S. Air Force)

** FILE ** In this March 2, 2012, photo, Air Force Col. Glenn Palmer, commander of the 737th Training Group at Lackland AFB, speaks to trainees in San Antonio. Officials tell the Associated Press that the Air Force has relieved Palmer, a top commander at Lackland Air Force base, from his position in the wake of wake of a widening sex scandal. (AP Photo/The San Antonio Express-News, William Luther)

** FILE ** In this March 2, 2012, photo, Air Force Col. Glenn Palmer, commander of the 737th Training Group at Lackland AFB, speaks to trainees in San Antonio. Officials tell the Associated Press that the Air Force has relieved Palmer, a top commander at Lackland Air Force base, from his position in the wake of wake of a widening sex scandal. (AP Photo/The San Antonio Express-News, William Luther)

Air Force Staff Sgt. Luis Walker arrives July 20, 2012, for the fourth day of his trial at Lackland Air Force Base in San Antonio. Walker is 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. (Associated Press/San Antonio Express News)

Air Force Staff Sgt. Luis Walker arrives July 20, 2012, for the fourth day of his trial at Lackland Air Force Base in San Antonio. Walker is 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. (Associated Press/San Antonio Express News)

U.S. Air Force Staff Sgt. Luis A. Walker arrives July 16, 2012, from a lunch break during his court martial at Lackland Air Force Base in San Antonio. Walker, a former training officer, is charged with illicit sexual contact with 10 female trainees. He is facing 28 counts including rape and is one of 12 instructors under investigation. (Associated Press/The San Antonio Express-News, Jerry Lara)