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.