Final answer:
FM 3-90 is the U.S. Army field manual that provides comprehensive guidance on Reconnaissance, Security, and Tactical Enabling Tasks.
Step-by-step explanation:
FM 3-90 covers Reconnaissance, Security, and Tactical Enabling Tasks within U.S. Army doctrine. This field manual provides guidance for commanders and staff on how to plan, execute, and assess reconnaissance and security operations. Its aim is to synchronize these operations with offensive, defensive, and stability or defense support of civil authorities (DSCA) operations to enable success on the battlefield. Reconnaissance tasks include obtaining information by visual observation or other detection methods, about the activities and resources of an enemy or potential enemy. Security tasks provide reaction time, maneuver space, and protect the force from surprise. Some examples of tactical enabling tasks include breaching, crossing, and passage of lines that enable the success of other maneuvers.