Class / briefing: Purpose: To obtain an overview and understanding of the OPFOR doctrine as contained in FM 7-100.1 Opposing Force: Operations. Operational Environment (OE) – a composite of the conditions, circumstance, and influences that affect the employment of military forces and bear on the decisions of the unit commander. Contemporary Operational Environment (COE) – the OE that exists in the world today and is expected to exist in the clearly foreseeable future.