Chicago agency Marc USA has been tapped as AOR for Jacksonville, Florida-based Firehouse Subs following a review that included 19 agencies that were narrowed to three finalists. Marc USA ultimately prevailed on the Firehouse Subs account, which bills approximately $30 million annually. The sandwich chain is planning a major expansion in coming years. Firehouse co-founder Robin Sorensen said the company, which has more than 900 restaurants today, plans to double that by 2020.