"In Sentinel, author Patrick McNamara provides an instructional guide filled with survival techniques for the family. Drawing from his background as a special-operations agent for twenty-two years, McNamara discusses the importance of being the protector of the family and provides a host of techniques, strategies, and procedures to ensure safety. He offers simple steps for being better prepared for power blackouts, home invasions, and attacks on the street and more. From your home to your vehicle and beyond, McNamara discusses how to plan for contingencies." -- From back cover.