Residents should not be alarmed if they see low-flying helicopters and hear explosions, police officials said.

Some San Antonio neighborhoods will sound and feel like a war zone as U.S. military personnel participate in an active combat simulation Monday night near downtown. Residents in central San Antonio can expect to hear “low-flying helicopters” and even “explosions” as part of an exercise to “enhance soldiers’ skills by operating in a realistic environment,” according to a notice posted on the San Antonio Police Department’s Facebook page...