Lackland is where every American airman receives basic training. It has about 475 instructors for the approximately 35,000 airmen who graduate every year. About one in five is female, pushed through eight weeks of basic training by a group of instructors, 90 percent of whom are men.

Opening statements began Tuesday and Walker's case included testimony from several of his alleged victims, including one woman who wiped away tears as she told the court that Walker lured her into an office and sexually assaulted her on a bed while ignoring her pleas to stop.

The women told jurors that Walker gained their trust to get them alone in his office or an empty dormitory where he forced them into kissing, touching and intercourse. Those testifying said they didn't tell anybody at first because they feared being booted from the Air Force.