Joint Base San Antonio Announces Technical Sergeant Selectees Published July 27, 2016 Joint Base San Antonio-Randolph JOINT BASE SAN ANTONIO-RANDOLPH, Texas -- Technical sergeant selectees from Joint Base San Antonio gathered at JBSA-Lackland and JBSA-Randolph for a group photo July 21. There were 319 staff sergeants across JBSA selected out of 33,569 in the Air Force who were eligible, with a total of 7,501 selected for promotion for a selection rate of 22.35 percent.