This manual focuses on the universally accepted tactics, techniques, and procedures in combat operations in any environment and climate (except in very extreme weather conditions) and is appropriate for any levels of conflict.      This manual primarily aims to provide guidance to the infantry rifle platoon leader, platoon sergeant, squad leader, and fire team leaders; to instructors and students of training units as well as writers involved in infantry manual development. Field commanders and staff officers, service schools, and other military training schools will also benefit greatly from this manual.      Leaders must use these TTPs, but they must not lose sight of the fundamental principles outlined in Chapter 1, Doctrine.