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The sexual misconduct at the base apparently began in 2009, but the first woman didn’t come forward until last year. The first allegations were levied against Walker, who is accused of crimes that allegedly took place between October 2010 and January 2011.

According to the Air Force charge sheet, Walker had sexual intercourse with four of the 10 female recruits. He also is accused of making flirtatious or sexually suggestive comments, sending inappropriate text messages and sometimes groping his recruits.

The charge sheet also includes allegations that Walker forced five recruits to engage in sexual acts by threatening their military careers. He’s accused of intimidating two of the women into lying about his alleged misconduct.

Walker was a trainer for about 18 months, until he was removed from his position in June 2011. He joined the Air Force in 2004 and previously was stationed at Dover Air Force Base in Delaware and at facilities in Montana and Korea. The Air Force is withholding his age and hometown.

Lackland is where every American airman reports for basic training — about 35,000 a year. About one in five is female, pushed through eight weeks of basic training by a flight of instructors that are about 90 percent male.

Six of the 12 instructors under investigation for misconduct face charges ranging from rape to adultery. Officials say nine of those instructors were in the same squadron.

The first court-martial in the case resulted in a plea agreement in June, when Staff Sgt. Peter Vega-Maldonado admitted to having sex with a female trainee. He struck a plea deal for 90 days of confinement. He later acknowledged being involved with a total of 10 trainees, a number previously unknown to investigators.