Mashantucket — Last year, amid the COVID-19 pandemic that caused Foxwoods Resort Casino to temporarily shut down for the first time, the Mashantucket Pequot Tribe stepped up its diversification efforts, hiring a chief executive officer to lead Command Holdings, a business-development company in the planning stages since 2017. On Tuesday, the new entity stepped out of the shadows, announcing its acquisition of CeLeen LLC, an information technology company headquartered near St. Louis, Mo., and Quattro Consulting LLC, a Washington, D.C.-based firm that provides services to government organiza...