For many Tustin residents, it’s not Christmas time until Santa and Mrs. Claus commandeer their reindeer-led sleigh through the neighborhood. With holiday music filling the air signaling Santa’s imminent arrival, families throughout Tustin once again gathered along local streets this month to greet the Jolly Old Elf as he pulled up, just the way they have for about the past 25 years, when the Tustin Police Department started the tradition. Guided by a police escort, Santa will visit neighborhoods in about 90 percent of the 11-square-mile city over multiple nights. “We try to hit the whole city because the entire…