Doctrine provides a military organization with unity of effort and a common philosophy, language, and purpose. This field manual (FM) provides doctrine for the tactical employment and operations of the maneuver enhancement brigade (MEB). FM 3-90.31 is intended to facilitate the operations and training requirements of the MEB as they organize, prepare for, and conduct operations. This initial FM will evolve after lessons learned from training and operational experiences are incorporated into future Army doctrine. This FM provides doctrinal guidance for commanders, staffs, and subordinate leaders to plan, prepare, execute, and assess MEB operations. The other intended audience for this publication is those leaders and staff sections within units that will employ an MEB or may operate under the command and control (C2) of the MEB. This publication should also be used to guide joint, interagency, and multinational higher headquarters commanders and staff on the employment of the MEB.