Technical controllers Marines operate and maintain technical control equipment. They establish technical control sites, locate and correct faults, or improve signal quality in communications networks to maintain adequate communications and data services for the MAGTF commander. Typical duties include testing of circuits to ensure circuit quality is maintained, repairing faults or degradation in communications networks, and maintaining records on activation/deactivation of communications links. Technical controller Marines operate and maintain tech control equipment by performing tasks including equipment adjustments and replacing faulty components/parts.