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When she saw a help-wanted advertisement for dispatchers, Tammie Harrington didn’t know she was applying for the job that would become a 20-year career.

“For me, it was just a stroke of luck,” Harrington said Tuesday. At the time, Harrington was a stay-at-home mother looking for work.

“I saw the ad in the paper,” she said. “I’d probably been here six months when I realized this was the job for me.”

She realized she had “a knack for helping people,” she said…