This publication, Field Manual FM 3-98 Reconnaissance and Security Operations July 2015, provides doctrinal guidance and direction for Cavalry organizations, as well as reconnaissance and security organizations. This FM establishes the foundation for the development of tactics and procedures in subordinate doctrine publications. This publication applies across the range of military operations. While the main focus of this field manual is Cavalry formations within the units listed below, all maneuver formations must be able to conduct reconnaissance and security tasks. – Armored brigade combat team (ABCT) Cavalry squadron. – Infantry brigade combat team (IBCT) Cavalry squadron. – Stryker brigade combat team (SBCT) Cavalry squadron. – Battlefield surveillance brigade (BFSB) Cavalry squadron. – It is applicable to the— – Scout platoon of maneuver battalions. – Combat aviation brigade air squadron. The principal audiences for FM 3-98 are commanders, leaders, and staffs responsible for the planning, execution, or support of reconnaissance and security operations as well as instructors charged with teaching reconnaissance and security operations. Doctrine consists of fundamental principles that describe how to fight. At the tactical level, doctrine consists of authoritative principles concerning how to execute reconnaissance and security operations as part of Army and joint operations that require professional military judgment in their application. Importantly, our doctrine must describe how brigade combat teams (BCT) and subordinate units combine the capabilities of various arms into cohesive, combined arms, air-ground teams and provide a clear description of how to execute reconnaissance and security operations. This publication provides the commander and staff of Cavalry formations with doctrine relevant to Army and joint operations. This publication explains how effective reconnaissance and security operations generate depth, allow commanders reaction time and maneuver space, fight for information and collect information through stealth, protect against surprise, ease the forward movement of follow-on forces, and provide commanders with flexibility and adaptability. The doctrine described in this publication is applicable across unified land operations. The previous proponent manual for Cavalry Operations was FM 3-20.96, published 12 March 2010, which included operational considerations. This publication provides doctrinal guidance for all formations assigned to the ABCT, the IBCT, and SBCT. The following is a summary of each chapter in the manual: Chapter 1 addresses the role of Cavalry in unified land operations and Cavalry organizations. Chapter 2 discusses understanding the threat, potential threat groups and threat characteristics. Chapter 3 addresses the operational environment, shaping, engaging, and influencing outcomes, and consolidating gains. Chapter 4 highlights the updated concepts of mission command in relation to commander’s reconnaissance and security guidance, the operations process and information collection. Chapter 5 begins with an overview, followed by a detailed discussion of the fundamentals of reconnaissance, forms of reconnaissance, and reconnaissance handover. Chapter 6 begins with an overview, followed with the fundamentals of security operations, counterreconnaissance, and the forms of security. Chapter 7 provides a short overview and then devotes a section to reconnaissance and security stability planning, stability principles and frameworks, and stability tasks. Chapter 8 describes sustainment for reconnaissance and security tasks, sustainment planning considerations for reconnaissance and security, sustainment considerations for reconnaissance and security and special sustainment consideration.