strategies, and procedures for finding hidden intelligence-gathering devices. SEOs continually are challenged to identify security risks, analyze those risks, and develop systems to ensure the integrity of Department of State computers and worldwide network information systems. U.S. Navy Seabees and a cadre of specially trained Security Technical Specialists (STS) assist SEOs with the maintenance and repair of our security systems. Domestically SEO's manage, plan, and provide engineering support to worldwide technical security programs and to the Secretary of State and visiting dignitaries. Overseas SEO's manage Engineering Service Centers (ESC) and Engineering Service Offices (ESO), which provide technical security to one or multiple posts under the management of Regional Security Officers (RSO). Security Technical Specialists (STS) are support personnel within the Bureau of Diplomatic Security who assist in worldwide technical security programs. These programs provide protection for Department of State facilities and personnel from technical espionage, acts of terrorism, and crime. In this protection effort, sophisticated electronic and electromechanical security systems are used throughout the world, which include: intrusion detection systems (IDS), closed-circuit television (CCTV) systems, vehicular and pedestrian access control systems, metal detectors, and explosive detection systems. STS's support technical security support domestically and at ESC's and ESO's worldwide. Diplomatic Couriers protect information by ensuring the secure movement of classified U.S. Government material across international borders to over 180 Foreign Service missions. Diplomatic pouches can contain thousands of pounds of equipment and construction materials, as well as classified documents bound for sensitive posts. Additionally, Diplomatic courier control officers escort sensitive, but unclassified, crated materials within the United States and across international boundaries. These materials receive the same secure shipment as diplomatic pouches but, unlike diplomatic pouches, are declared to customs on entry into a country. The Diplomatic Courier Service securely delivered over 9.5 million pounds of classified material and 1 million pounds of controlled material last year. The Diplomatic Courier Service is constantly evolving to meet the increasingly restrictive guidelines imposed by various countries. Civil Service specialists Contract security and administrative support staff Personnel killed in action Almost 100 direct-hire DS employees and contractors have been killed in action while employed by the Bureau. Note With the exception of GS employees of DS serving domestically, most DS personnel are members of the United States Foreign Service, serving as Specialists. See also U.S. Diplomatic Security's Mobile Security Deployments (MSD) U.S. Diplomatic Security Service (DSS) List of United States federal law enforcement