A former trainer at Joint Base San Antonio-Lackland has been convicted of sexual misconduct and sentenced to two years in custody.

The San Antonio Express-News reports Senior Airman Christopher Oliver on Wednesday was also given a dishonorable discharge.

Oliver is a former elite training instructor at Lackland AFB. He pleaded guilty to having adulterous relationships with three female trainees but had contested other charges dating back about two years when he was a staff sergeant.

A military judge convicted Oliver of consensual sodomy, wrongful sexual contact, adultery, dereliction of duty and having unprofessional relationships.

More than 30 instructors at Joint Base San Antonio-Lackland have been charged with sexual misconduct. Most of those tried so far have been convicted.