It also provides model response procedures and information that can be used to implement security plans as required in Part 10 of the U.S. Code of Federal Regulations and Part 73.55 Appendix C. It focuses on initial reactions to alarms -- quickly assessing them, determining the threat level, then making tactical responses to threats. Four classes of alarms are covered in increasing order of gravity: (A) Class A alarms indicating threats of substantial magnitude, such as a vehicle forcing its way into or out of a protected or vital area or an unauthorized person found in a vital area; (2) Class B alarms of a slightly lesser threat, including someone coming or leaving over a fence, detecting component damage, or the sounding of several types of alarms; (3) Class C alarms, indicating a possible threat but of an unknown degree, such as someone coming toward a fence, a civil disturbance, or a jammed security radio frequency; and (4) Class D alarms of low threat likelihood, such as a fire alarm or fence motion detector alarm. Photographs, diagrams, references, bibliography, glossary, and an appendix are provided.