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SAN ANTONIO -- A military prosecutor has told jurors that a Texas Air Force base instructor charged with raping a female trainee and coercing others into having sex with him is a consummate predator.

The prosecutor, Major Patricia Gruen, told the seven-member military jury at the outset of Staff Sgt. Luis Walker s court-martial Tuesday that Walker raped the trainee in a supply closet at Lackland Air Force Base and had inappropriate sexual contact with others in a dormitory.

Walker is the first to stand trial in a sex scandal at the San Antonio base where U.S. airmen go through basic training that has led to charges or investigations against 12 people.

Defense attorneys told jurors there is no evidence corroborating the trainees claims.

Walker faces up to life in prison if convicted.

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