Book excerpt: Building Entry and Room Clearing Tactics by Scott Kirshner covers sound tactical principles to prevail in violent encounters during the worst-case scenario. Covered in this book are foundational principles for conducting building entry and room clearing whether you are a law enforcement officer or a law abiding armed civilian. Team entries and solo entries are covered. Disadvantages of certain entry techniques are discussed along with reasons why you may choose not to use these entry methods. Kirshner discusses close quarter battle to include the rudimentary skills of: -Mindset -Situational Awareness -Color Codes -OODA Loop. This work contains insightful and relevant information on the high-risk task of conducting building entries and room clearing. Commit to WIN, SURVIVE and PREVAIL against violence and take your skills to the next level.