text: Chapter 2
  2-125. The commander makes only those changes to the plan needed to correct variances. The commander
  keeps as much of the current plan the same as possible. This presents subordinates with the fewest possible
  changes. The fewer the changes,the less resynchronization needed,and the greater the chance changes will
  be executed successfully.
  2-126. When possible, the commander and staff ensure changes do not preclude options for future
  operations. The staff develops options during planning, or the commander infers them based on the staff
  assessment of the current situation. Developing or inferring options depends on validating earlier assumptions
  and updating planning factors and staff estimates. The concept of future operations may be war-gamed using
  updated planning factors,estimates,and assumptions. (See chapter 4.) The commander projects the situation
  in time,visualizes the flow of battle,and projects the outcomes of future operations and consolidating gains.
  Main and Supporting Efforts
  2-127. The commander designates main and supporting efforts to establish clear priorities of support and
  resources among subordinate units. The main effortis a designated subordinate unit whose mission at a given
  point in time is most criticalto overall mission success (ADP 3-0). The main effort is usually weighted with
  the preponderance of combat power or the operation is designed where the effort is singularly focused. Task
  centric execution may be by event or phase. Typically, the commander shifts the main effort one or more
  times during execution. Designating a main effort temporarily prioritizes resource allocation. When the
  commander designates a unit as the main effort, it receives priority of support and resources in order to
  maximize combat power. The commander establishes clear priorities of support, and shifts resources and
  priorities to the main effort as circumstances and the commander’s intent require. The commander may
  designate a unit conducting a shaping operation as the main effort until the decisive operation commences.
  However,the unit with primary responsibility for the decisive operation then becomes the main effort upon
  the execution of the decisive operation.
  2-128. Asupporting effortis a designated subordinate unit with a mission that supports thesuccess of the
  main effort (ADP 3-0). The commander resources supporting efforts with the minimum assets necessary to
  accomplish the mission. The force often realizes success of the main effort through the success of the
  supporting effort(s). (SeeADP 3-0 for additional information.)
  FORCE PROJECTION
  2-129. Force projectionis the ability to project the military instrument of national power from the United
  States or another theater,in response to requirements for military operations (JP 3-0). Future conflicts will
  place a premium on promptly deploying landpower and constantly adapting to each campaign’s unique
  circumstances as they occur and change. Army forces combine expeditionary capability and campaign quality
  to contribute crucial,sustained landpower to unified action.
  2-130. Expeditionary capability is the ability to promptly deploy combined arms forces worldwide into any
  area of operations and conduct operations upon arrival. The BCT’s ability to alert,mobilize,rapidly deploy
  with little notice, and operate immediately on arrival enables it to shape conditions early within the
  operational area and exploit successes while consolidating gains at the tactical level.
  2-131. Campaign quality is the ability to sustain operations as long as necessary and to conclude operations
  successfully. The Army’s campaign quality extends its expeditionary capability well beyond deploying
  combined arms forces that are effective upon arrival. It is an ability to conduct sustained operations for as
  long as necessary, adapting to unpredictable and often-profound changes in an operational environment as
  the campaign unfolds. The BCT is organized,trained,and equipped for endurance with an appropriate mix
  of combat forces together with maneuver support and sustainment units. (SeeADP3-0 and FM 3-0 for more
  information.)
  PREPARATIONS
  2-132. The success of the BCT in combat operations begins with its preparations for combat. These
  preparations include a mission-oriented training program, pre-mobilization and predeployment plans that
  support the BCT’s specific regional contingencies. Given these contingencies,the commander and the staff