Final answer:
Essential Tasks are approved by the commander and are included in the unit's mission-essential task list (METL), which is crucial for maintaining the unit's operational readiness and effectiveness.
Step-by-step explanation:
The question you are asking pertains to the structure of military or other organizational operations. Essential Tasks are approved by the commander and are always included in the unit's mission-essential task list (METL). The METL is a comprehensive list that identifies the fundamental tasks for which the unit has been designed and must be able to perform under a range of expected conditions. It is vital for ensuring that the unit maintains operational readiness and effectiveness. Each task within the METL is carefully selected and regarded as essential for the unit to accomplish its overall mission.