Proteus Capital Solutions, a Maryland-based private equity firm, completed the acquisition of CSSI, a company working to improve national air transportation networks. Financial terms were not disclosed. “I am proud of our employees and what our team has built over the years, and we are excited to expand our success as we partner with Proteus. We felt an immediate synergy, and we look forward to leveraging Proteus’ knowledge and expertise as an experienced government services and technology investor. As I step into the role of CEO, I plan to build on our core capabilities while expanding our customer base and continuing to deliver best-in-class solutions,” Kelly Caccetta, CSSI CEO and President.