This Army tactics, techniques, and procedures (ATP)/Marine Corps reference publication (MCRP) is the Army’s doctrinal publication for operations in the cold region environment. Marines can utilize this publication as an operational reference with the 3-35 doctrinal series. It provides doctrinal guidance and direction for how United States (U.S.) forces conduct cold region operations. The purpose of ATP 3-97.11/MCRP 3-35.1D is to arm leaders, Soldiers, and Marines with the necessary knowledge on how to operate in cold region environments. The information contained in this manual applies to all Soldiers and Marines, regardless of rank or job specialty. This manual is designed to work with and complement field manual (FM) 3-97.6, Mountain Operations, and FM 3-97.61, Military Mountaineering. This manual will enable leaders, Soldiers, and Marines to accurately describe cold region environments, their effects on military equipment, impacts these environments have on personnel, and most importantly, how to employ the elements of combat power in cold region environments. This ATP provides the conceptual framework for conventional forces to conduct cold region operations within the construct of full spectrum operations, across the spectrum of conflict. It addresses cold region operations at operational and tactical levels. Chapter 1 discusses the characteristics of the cold region environment. Chapter 2 discusses the operations process. Chapter 3 identifies and discusses special considerations for operations in a cold region environment. Chapter 4 discusses how to conduct movement and maneuver in a cold region environment. Chapter 5 discusses how to apply sustainment principles unique to cold regions. Chapter 6 discusses how to apply combat power in the cold region environment. The two appendixes detail the special uniform, equipment, and heaters necessary in the cold region environment