Air Force Instructor Sentenced To 20 Years In Prison For Rape And Sexual Assault | Late Friday night, a military jury found Staff Sgt. Luis Walker guilty of seven counts of rape and sexual assault, bringing one more assailant to justice in the widespread sexual assault scandal at Lackland Airforce Base. Walker was sentenced to 20 years in prison for “inappropriate sexual contact,” including rape and aggravated assault, with at least ten women. Overall, there are at least 31 victims who allege sexual assault by one of 12 training officers at Lackland. Another man, Staff Sgt. Peter Vega-Maldonado, has already accepted a plea deal and is currently serving 90 days in jail.