WATERFORD — Charter Oak Federal Credit Union has promoted Sonya Armstrong and Michael Ballirano to assistant vice presidents and regional retail managers.
Armstrong had served as the branch officer of Charter Oak’s Dayville, Willimantic and Killingly High School branches. She began her career with Charter Oak as a teller and continued on as a Member Service Representative and Work Leader before being promoted to branch manager in April 2008. She was promoted to branch officer in June 2014.
She is a graduate of the Credit Union League of Connecticut’s Executive Education Program. Armstrong serves as Treasurer of the Brooklyn Cub Scout Pack 44 and is a member of the Killingly Business Association.
Ballirano, who joined Charter Oak in 2011, had served as the branch officer of the Mohegan Sun Branch and was promoted several times.


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