In a fully integrated security system, protection objectives can be achieved through the selection and integration of protective measures from the following subsystem options: facilities and architectural barriers to deter and delay the adversary; physical security equipment to assist detection and assess intrusion attempts and unauthorized activities; communication systems that collect, integrate, transmit, and display alarm and other data for operator response; security personnel; and security procedures. System integration is both a process and a product of security systems engineering. Implementing a security system involves preparing facilities, acquiring system hardware, testing, evaluation, training, and establishing a comprehensive logistics support system. The security manager's role in system engineering, design, integration, implementation, and operation is described. 7 figures.