This document outlines principles and tactics for close quarters battle (CQB) entry. It discusses the importance of surprise, speed, and violence of action. It also lists the eight fundamentals of CQB as dominating the enclosure, eliminating all threats, controlling occupants, searching the dead and rooms, situational reports, and evacuating on command. Additionally, it defines initiative-based tactics (IBT) as enclosure clearing driven by individual shooter initiative within a framework of shared techniques and fundamentals. IBT aims to create a flexible system through independent decision making based on immediate dangers and threats while protecting teammates.