3-73. The mission-essential task list (METL) provides focus for training. The credibility of Army forces stems first and foremost from their capability to wage large-scale combat operations. Brigade combat teams (BCTs) and multifunctional brigades generally provide most of the Soldiers performing operations to shape. Those operations may require proficiency in tasks not directly linked to the METL, so commanders determine where to assume risk during preparation in order to ensure flexibility across the force. Realistic training with limited time and resources demands that commanders focus their unit training efforts to maximize training proficiency. (See chapter 2 for additional information on training.)