SAN DIEGO and MCLEAN , Va . , July 30 / PRNewswire-FirstCall / -- Science Applications International Corporation ( NYSE : SAI ) today announced it has been awarded a prime contract by the U.S. Department of Homeland Security ( DHS ) Office of Cybersecurity and Communication . SAIC will provide scientific , engineering and technical services in support of the National Communications System ( NCS ) , a cornerstone of the country 's ability to provide key communications services to support government functions during emergencies .