SAN ANTONIO, Texas – Digital Defense Inc. has hit the century mark, signing its 100th subscriber to the IT security firm's Proactive Managed Services suite. Coastal Federal Credit Union, a billion-dollar CU based in Raleigh, N.C., has signed on to the Texas-based firm's roster of clients, many of whom are credit unions. Digital Defense was formed by Department of Defense IT security veterans and specializes in providing network security through automated internal and external vulnerability assessments and additional support. It has clients in 43 states.