text: Glossary
  *denial operations
  Actions to hinder or deny the enemy the use of terrain, supplies, or facilities.
  *destroy
  A tactical mission task that physically renders an enemy force combat-ineffective until reconstituted.
  *detachment left in contact
  An element left in contact as part of the previously designated security force while the main body
  conducts its withdrawal.
  *diamond formation
  A movement formation with one element leading, one element positioned on each flank, and the
  remaining elements to the rear.
  *direct pressure force
  A force employed in a pursuit that orients on the enemy main body to prevent enemy disengagement or
  defensive reconstitution.
  directed obstacle
  An obstacle directed by a higher commander as a specified task to a subordinate unit.
  (ATP 3-90.8/MCTP 3-34B)
  direction of attack
  A specific direction or assigned route a force uses and does not deviate from when attacking.
  (ADP 3-90)
  *disengage
  A tactical mission task in which a unit breaks contact with an enemy to conduct another mission or to
  avoid becoming decisively engaged.
  *disengagement criteria
  Protocols that specify those circumstances where a friendly force must break contact with the direct
  fire and observed indirect fire to avoid becoming decisively engaged or to preserve friendly combat
  power.
  disengagement line
  A phase line located on identifiable terrain that, when crossed by the enemy, signals to defending
  elements that it is time to displace to their next position. (ADP 3-90)
  *dismounted movement
  A movement of troops and equipment mainly by foot, with limited support by vehicles.
  *disrupt
  1.A tactical mission task in which a unit upsets an enemy’s formation or tempo and causes the enemy
  force to attack prematurely or in a piecemeal fashion.. 2. An obstacle effect that focuses fire planning
  and obstacle effort to cause the enemy to break up its formation and tempo, interrupt its timetable,
  commit breaching assets prematurely, and attack in a piecemeal effort.
  *double envelopment
  A variation of envelopment where forces simultaneously attack along both flanks of an enemy force.
  *echelon formation
  A movement formation with elements arranged on an angle to the left or to the right of the direction of
  attack (echelon left, echelon right).
  electromagnetic protection
  A division of electromagnetic warfare involving actions taken to protect personnel, facilities, and
  equipment from any effects of friendly or enemy use of the electromagnetic spectrum that degrade,
  neutralize, or destroy friendly combat capability. (JP 3-85)
  electromagnetic reconnaissance
  The detection, location, identification, and evaluation of foreign electromagnetic radiations. (JP 3-85)