This publication, Army Techniques Publication ATP 3-09.50 MCWP 3-1.6.23 The Field Artillery Cannon Battery July 2015, provides doctrinal guidance for commanders and subordinate leaders who are responsible for conducting cannon battery functions or tasks. It serves as an authoritative reference for personnel responsible for developing: - Doctrine (fundamental principles; tactics, techniques, and procedures) material and force structure. - Institution and unit training. - Tactical standard operating procedures for cannon battery units. ATP 3-09.50 reflects and supports unified land operations doctrine contained in Army doctrine publication 3-0 and Army doctrine reference publication (ADRP) 3-0. ATP 3-09.50 contains 12 chapters and 4 appendices: - Chapter 1 provides an overview and discussion of cannon unit organization and tactical duties of key personnel. The chapter discusses the transition from 2 firing batteries of 8 howitzers each to 3 firing batteries of 6 howitzers each in all brigade combat teams and the introduction of composite (mixed-caliber) battalions in Infantry brigade combat teams. - Chapter 2 discusses considerations for employing a cannon battery in various climates and terrain. - Chapter 3 provides an overview and discussion of techniques and associated considerations for reconnaissance, selection, and occupation of a firing position. - Chapter 4 considers techniques for laying the platoon or battery, and measuring and reporting data associated with the gunnery solution. The chapter covers use of the gun laying and positioning system, M2A2 aiming circle, M2 compass, and reciprocal laying by other howitzers. - Chapter 5 provides an overview and discussion of techniques and associated considerations for battery defense against armored or mechanized forces, air attack, dismounted attack, indirect fire, and chemical, biological, radiological, and nuclear attack. - Chapter 6 identifies the techniques and associated considerations for hasty survey. - Chapter 7 discusses the types, elements, and sequence of fire commands. - Chapter 8 provides a summary of the steps for computing minimum quadrant elevation. - Chapter 9 provides an overview and discussion of other considerations unique to composite units. - Chapter 10 provides a brief overview and discussion of techniques and associated onsiderations unique to cannon batteries operating as distributed units. - Chapter 11 discusses other considerations for cannon batteries operating as composite or distributed units - training, battery tasks, sustainment, communications, fire support, survey, and meteorological tasks. - Chapter 12 Identifies planning considerations associated with deployment as early as possible in the military decision making process. - Appendix A provides techniques and associated considerations for precision munitions and ammunition management. - Appendix B identifies sample mission checklists. - Appendix C addresses techniques and associated considerations for overcoming common mistakes and malpractices. - Appendix D provides examples and discussion of required forms. - Appendix E discusses the declination of the aiming circle and the M2 compass. - Appendix F describes the employment of Killer Junior - the use of high explosive direct fire against dismounted attacks.