Army Doctrine Publication (ADP) 3-90 provides the doctrine on the conduct of offensive and defensive tasks. It establishes a common frame that commanders, supported by their staffs, use to plan, prepare, execute, and assess offensive or defensive tasks. The doctrine in this publication is a guide for action rather than a set of fixed rules. ADP 3-90 also forms the foundation for training and Army education system curricula on the conduct of tactical offensive and defensive tasks. In operations, effective leaders recognize when and where doctrine, training, or even their experience no longer fits the situation and adapt accordingly. The principal audience for ADP 3-90 is all members of the profession of arms. Commanders and staffs of Army headquarters serving as joint task force or multinational headquarters should also refer to applicable joint or multinational doctrine concerning the range of military operations and joint or multinational forces. Readers should also refer to Army Doctrinal Reference Publication (ADRP) 3-90, Offense and Defense, for a more detailed explanation of the doctrine associated with the conduct of offensive and defensive tasks. Specific tactics and procedures associated with offensive and defensive tactics and associated enabling tasks are located in Field Manual (FM) 3-90, Offensive and Defensive Tactics. Commanders, staffs, and subordinates ensure their decisions and actions comply with applicable U.S., international, and, in some cases, host-nation laws and regulations. Commanders at all levels ensure their Soldiers operate in accordance with the law of war and the rules of engagement. (See FM 27-10.) ADRP 3-90 implements standardization agreement (STANAG) Allied Tactical Publication-3.2.1. ADP 3-90 uses joint terms where applicable. Selected joint and Army terms and definitions appear in both the glossary and the text. These terms are italicized and the number of the proponent publication follows the definition. ADP 3-90 applies to the Active Army, the Army National Guard (ARNG) /Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR) unless otherwise stated. The proponent of ADP 3-90 is the U.S. Army Combined Arms Center. The preparing agency is the Combined Arms Doctrine Directorate, United States Army Combined Arms Center.