U.S. Department of State Markets U.S. Department of State U.S. Department of State CNSI supports the U.S. Department of State in the areas of Diplomatic Security (DS) and Overseas Building Operations (OBO). Bureau of Diplomatic Security CNSI supports the Bureau of Diplomatic Security in providing a safe and secure environment for conducting U.S. foreign policy and protecting people, information and property through mission critical Tier 1, Tier 2 and Tier 3 IT Help Desk Services to the Chief Technology Officer of Diplomatic Security. Bureau of Overseas Building Operations CNSI provides turn-key design-build Technical Security Systems (TSS) and Secure & non-secure Voice & Data Telecommunications Network Systems. These services encompass a full spectrum of services from: engineering, equipment provisioning, installation, test and acceptance for new Embassy construction projects. These systems are supported by subsystems such as: intrusion detection, CCTV, intercom systems, access controls as well as perimeter monitoring.