Former MTI sexual misconduct trial set Published July 12, 2012 JOINT BASE SAN ANTONIO -- LACKLAND, Texas (AFNS) -- The case of a former Air Force military training instructor (MTI) alleged to have engaged in sexual misconduct and unprofessional relationships with female basic military trainees will go to a general court-martial on July 16, at 8:30 a.m. at Joint Base San Antonio-Lackland. The trial is expected to last about five days. The allegations arose against Staff Sgt. Luis Walker of the 326th Training Squadron, Lackland Air Force Base, on June 24, 2011, and the Air Force Office of Special Investigations (AFOSI) immediately launched an investigation. Walker is presumed innocent until and unless proven guilty beyond a reasonable doubt. .