SAN ANTONIO — Two people were killed in an apparent murder-suicide at Lackland Air Force Base in San Antonio on Friday that triggered a lockdown at the facility, the Bexar County Sheriff’s Office said.“It’s over,” Bexar County Sheriff’s office spokesman James Keith said, adding that deputies were still on the scene.The commanding officer of the 331st K-9 Training Squadron at the base was shot by an airman, according to the Air Force Times, an independent news outlet, citing on internal Pentagon communications.